Email Definition and 190 Threads

Electronic mail (email or e-mail) is a method of exchanging messages ("mail") between people using electronic devices. Email entered limited use in the 1960s, but users could only send to users of the same computer, and some early email systems required the author and the recipient to both be online simultaneously, similar to instant messaging. Ray Tomlinson is credited as the inventor of email; in 1971, he developed the first system able to send mail between users on different hosts across the ARPANET, using the @ sign to link the user name with a destination server. By the mid-1970s, this was the form recognized as email.
Email operates across computer networks, primarily the Internet. Today's email systems are based on a store-and-forward model. Email servers accept, forward, deliver, and store messages. Neither the users nor their computers are required to be online simultaneously; they need to connect, typically to a mail server or a webmail interface to send or receive messages or download it.
Originally an ASCII text-only communications medium, Internet email was extended by Multipurpose Internet Mail Extensions (MIME) to carry text in other character sets and multimedia content attachments. International email, with internationalized email addresses using UTF-8, is standardized but not widely adopted.The history of modern Internet email services reaches back to the early ARPANET, with standards for encoding email messages published as early as 1973 (RFC 561). An email message sent in the early 1970s is similar to a basic email sent today.

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  1. S

    "Third-party" for email but who is which "person"?

    My best guess is this question could be about something linguistic, but it's also technical about online accounts and email addresses. One can choose to let's say, create a Microsoft account, use a "third-party" email address and therefore not create the MS account to have an outlook.com...
  2. phinds

    Not getting email notifications

    About 10 days ago my email got screwed up due to a change by my ISP. I got it fixed several days ago but I STILL am not getting notifications by email of watched threads even though I AM getting notifications on the site. According to my settings (email is correct by blacked out to avoid...
  3. R

    What is open rate?

    Allowed to think?
  4. W

    Should I set up SPF, DKIM, DMARC, or forward email to Gmail account?

    Ok, so now occasional spam, scam mails in my Outlook account have become almost weekly, and I want to reduce them to the degree feasible. Ive had my account spoofed too. Upon reading, seems setting up the triplet SPF, DKIM, DMARC, will lower such junk. Another option is forwarding my Outlook...
  5. W

    Tracking Down Scam email Details using Source of email, from Outlook

    Hi, Trying to track down a spammer, using the source that Outlook provides for all emails received. The message seems to have gone through several servers, and have failed several security/legitimacy tests, such as SPF. I have the IP addresses, server names of the source (77.178...) and...
  6. E

    Schools Academic email domains and blocking properties

    Hi, I need to email a professor but his university automatically rejects email like gmail. What email address domain I can get that can pass through his university spam filter and the email reached hiim? Thank you.
  7. F

    Hide email on profile page?

    Just realized our email addresses are public on our PF profiles. Is there not a way to hide it?
  8. E

    Viber, Fax, other methods of using a credit card to pay

    Hi, A company doesn't have an online store. They accept credit card payment via email or fax. Email is not secure. And I don't have a fax machine. They don't use viber. What other medium that one can send credit card information except fax. And can't fax be intercepted? Apprecited and thank...
  9. W

    Just received a Hacking Threat by email

    Here's an email I received today, from
  10. W

    Asked to Verify email when Unsubscribing from unsolicited e-mails

    Ok, so, I guess like just everyone else, I receive a(n) (over)load of spam in my Yahoo/Gmail accounts. Some of the emails offer the option to unsubscribe.Yet when I accept it, I'm asked to provide my email. Is this standard/legit? I suspect these sites use a spambot and generates random...
  11. Ahmed1029

    Is recieving such an email on desk rejection a good sign?

    I recently submitted a self-authored article with no affiliation to a peer reviewed journal, which then got desk rejected. The email however wasn't a generic one; the editor made a comment about its content that clearly indicates he read the whole thing, but he didn't correct me or say anything...
  12. W

    Text from scammer originating from email address rather than phone

    Hi, I received a scam text with links included on my Android S9 phone. Sender appears as an email address, rather than as a phone number. My texting program allows the blocking of phone number does not include the feature of blocking the originating email address. Any ideas of how else I can...
  13. kyphysics

    The Future of Email Account Usernames

    I tried creating a new Gmail account. I have several that have become de facto defunct (lost passwords with no way to recover). . . I've noticed every combination of words/letters for my attempted new username entry had been taken. That sucks. I had to literally come up with a stupid...
  14. R

    Python In Python flask I am trying to set up the SMTP for emails in outlook

    I am trying setting up flask email for outlook. I had it working with gmail I found this link https://superuser.com/questions/1521236/how-to-allow-less-secure-app-access-in-microsoft-email I tried MAIL_SERVER= 'smtp.office365.com' MAIL_PORT = 587 MAIL_USE_TLS = True...
  15. A

    Viewing email address of WhatsApp contacts

    Can i view email address of my WhatsApp contacts? I am unable to view email address since the signing up was done using phone number by my contacts? If the Sign up was done by the contact using email address,then i would have been able to view his/her email address ? Thanks & Regards, Prashant...
  16. kyphysics

    Possible to Get Malware by Just Opening an Email?

    I've been getting emails from an "hq@bill.com" address that have looked suspicious. The titles usually say something like: "Invoice prepared for you and will become payment." Usually, I just delete them. Today, my mouse/hand slipped and I accidentally hovered over and clicked onto that...
  17. kyphysics

    I Just Forgot my Email Password that I Created/Changed Today

    I suck. I NEVER write down my email passwords for fear of them getting stolen. I created a new password for one of my email accounts today. Already, I've forgotten it. I know very generally what it's "like," but cannot nail down the letters. Worse is that I didn't enter a recovery method...
  18. F

    How do spammers get our names and our email IDs of "me and my friend"?

    I often receive a spam email sent to me, Frodo <me@example.com>, and purporting to come from a friend of mine, Tom Thumb, whose ID is Tom <my_friend@anymail.com>. I am sure it isn't random chance as I don't get similar emails from people I don't know. How does the spammer work out that Frodo...
  19. F

    How to read email attachments without downloading

    If one reads email attachments without downloading, could they catch viruses?
  20. archaic

    Java JavaFX layout not updating and email sending optimization problem

    I am writing a java application that would let me bulk send emails. The first problem I have is that of performance; approximately 15 seconds per 5 emails. The second problem, which is the more important, is that my JavaFX is not updating the scene. My code below shows that the way I intended...
  21. Y

    ATT Email Sign-In Help for Alan

    Hi I started having problem in keeping my ATT @sbcglobal.net email sign in. It used to be able to choose keep sign in for 2 weeks, I don't have to re-signin for two weeks. But something happened and now I have to sign in every two hours or so even if I check the keep sign-in for two weeks. This...
  22. P

    MHB Aidan's question via email about Fourier Transforms (2)

    In order to use the Second Shift Theorem, the function needs to be entirely of the form $\displaystyle f\left( t - 1 \right) $. To do this let $\displaystyle v = t - 1 \implies t = v + 1 $, then $\displaystyle \begin{align*} \mathrm{e}^{-2\,t} &= \mathrm{e}^{-2 \, \left( v + 1 \right) } \\ &=...
  23. P

    MHB Aidan's question via email about Fourier Transforms

    In order to factorise this quadratic, we will need to recognise that $\displaystyle \mathrm{i}^2 = -1 $, so we can rewrite this as $\displaystyle \begin{align*} \frac{1}{6 + 5\,\mathrm{i}\,\omega - \omega ^2 } &= \frac{1}{\mathrm{i}^2\,\omega ^2 + 5\,\mathrm{i}\,\omega + 6} \\ &= \frac{1}{...
  24. P

    MHB Chloe's question via email about a p-value

    I'm assuming the hypothesis test is $\displaystyle H_0 : \mu = 13 \quad \quad H_a : \mu < 13 $ We are given $\displaystyle \mu = 13, \quad \sigma = 2.47, \quad \bar{x} = 12.86 , \quad n = 20 $. The test statistic is $\displaystyle \begin{align*} z &= \frac{\bar{x} -...
  25. P

    MHB Abdullah's question via email about Runge Kutta scheme

    First we need to write the DE as a system of first order DEs. Let $\displaystyle u = y $ and $\displaystyle v = y' $. Then $\displaystyle \begin{align*} x^2\,y'' - 5\,x\,v + 7\,u &= 2\,x^3\ln{\left( x \right) }\\ x^2\,y'' &= 5\,x\,v - 7\,u + 2\,x^3\ln{ \left( x \right) } \\ y'' &=...
  26. P

    MHB Solving Integral Equation w/ Laplace Transform - Abdullah

    We would need to recognise that the integral in the equation is a convolution integral, which has Laplace Transform: $\displaystyle \mathcal{L}\,\left\{ \int_0^t{ f\left( u \right) \,g\left( t - u \right) \,\mathrm{d}u } \right\} = F\left( s \right) \,G\left( s \right) $. In this case...
  27. P

    MHB Oscar's question via email about solving a DE using Laplace Transforms

    Taking the Laplace Transform of the equation gives $\displaystyle \begin{align*} s^2\,Y\left( s \right) - s\,y\left( 0 \right) - y'\left( 0 \right) + 7 \left[ s\,Y\left( s \right) - y\left( 0\right) \right] + 6\,Y\left( s \right) &= \frac{60\,\mathrm{e}^{-6\,s}}{s} \\ s^2\,Y\left( s \right) -...
  28. P

    MHB Seth's question via email about a Laplace Transform

    Since this is of the form $\displaystyle \frac{f\left( t \right)}{t} $ we should use $\displaystyle \mathcal{L}\,\left\{ \frac{f\left( t \right) }{t} \right\} = \int_s^{\infty}{F\left( u \right) \,\mathrm{d}u } $. Here $\displaystyle f\left( t \right) = \cosh{\left( 4\,t \right) } - 1 $ and so...
  29. P

    MHB Mahesh's question via email about a Runge-Kutta scheme

    To apply this Runge-Kutta scheme, we will need to write our second order DE as a system of first order DEs. Let $\displaystyle u = y $ and $\displaystyle v = y' $, then we have $\displaystyle \begin{align*} y'' + 4\,v - 7\,u^2 &= 0.2 \\ y'' &= 0.2 - 4\,v + 7\,u^2 \end{align*} $ So our system...
  30. P

    MHB Lachlan's question via email about the Bisection Method

    The Bisection Method solves equations of the form $\displaystyle f\left( x \right) = 0 $ so we must write the equation as $\displaystyle 11\cos{ \left( x \right) } - 1 + 2\,\mathrm{e}^{-x/10} = 0 $. We can then see that $\displaystyle f\left( x \right) = 11\cos{ \left( x \right) } - 1 +...
  31. P

    MHB Hayldiburasomas' question via email about Secant Method

    The Secant Method is a numerical scheme to solve equations of the form $\displaystyle f\left( x \right) = 0 $, so we must rewrite the equation as $\displaystyle 0 = \frac{1}{2}\,x^2 - 10 - \sin{ \left( 1.8\,x \right) } $. Thus $\displaystyle f\left( x \right) = \frac{1}{2}\,x^2 - 10 - \sin{...
  32. P

    MHB Alexander's question via email about Newton's Method

    Alexander asks: Apply three iterations of Newton's Method to find an approximate solution of the equation $\displaystyle \mathrm{e}^{1.2\,x} = 1.5 + 2.5\cos^2{\left( x \right) } $ if your initial estimate is $\displaystyle x_0 = 1 $. What solution do you get?
  33. P

    MHB Lachlan's question via email about the Bisection Method

    The Bisection Method is used to solve equations of the form $\displaystyle f\left( x \right) = 0 $, so we need to rewrite the equation as $\displaystyle 8\cos{ \left( x \right) } - \mathrm{e}^{-x/7} = 0 $. Thus $\displaystyle f\left( x \right) = 8\cos{ \left( x \right) } - \mathrm{e}^{-x/7} $...
  34. P

    MHB Jun's question via email about Runge Kutta Scheme....

    You first have to write this DE as a system of first order equations. Note, since $\displaystyle t$ does not appear in the original DE, that means that the system will be autonomous if kept in terms of $\displaystyle t$. Let $\displaystyle y = u$ and $\displaystyle y' = v$, then...
  35. P

    MHB Adam's question via email about Laplace Transforms

    Take the Laplace Transform of the equation: $\displaystyle \begin{align*} s\,Y\left( s \right) - y\left( 0 \right) + 11\,Y\left( s \right) &= \frac{3}{s^2} \\ s\,Y\left( s \right) - 5 + 11\,Y\left( s \right) &= \frac{3}{s^2} \\ \left( s + 11 \right) Y\left( s \right) &= \frac{3}{s^2} + 5 \\...
  36. P

    MHB Jun's question via email about Laplace Transform

    Upon taking the Laplace Transform of the equation we have $\displaystyle \begin{align*} s^2\,Y\left( s \right) - s\,y\left( 0 \right) - y'\left( 0 \right) + 4\,Y\left( s \right) &= -\frac{8\,\mathrm{e}^{-6\,s}}{s} \\ s^2 \,Y\left( s \right) - 2\,s - 0 + 4\,Y\left( s \right) &=...
  37. P

    MHB Massaad's question via email about Laplace Transforms

    Taking the Laplace Transform of the equation gives $\displaystyle \begin{align*} s^2\,Y\left( s \right) - s\,y\left( 0 \right) - y'\left( 0 \right) - 5\left[ s\,Y\left( s \right) - y\left( 0 \right) \right] - 6\,Y\left( s \right) &= -\frac{126\,\mathrm{e}^{-6\,s}}{s} \\ s^2\,Y\left( s \right) -...
  38. P

    MHB Mahesh's question via email about Laplace Transforms (2)

    This requires the convolution theorem: $\displaystyle \int_0^t{f\left( u \right) \,g\left( t- u \right) \,\mathrm{d}u } = F\left( s \right) \,G\left( s \right) $ In this case, $\displaystyle g\left( t - u \right) = \mathrm{e}^{-3\,\left( t - u \right) } \implies g\left( t \right) =...
  39. P

    MHB Mahesh's question via email about Laplace Transforms (1)

    Start by taking the Laplace Transform of both equations, which gives $\displaystyle \begin{cases} s\,X\left( s \right) - s\,x\left( 0 \right) + X\left( s \right) + 6\,Y\left( s \right) = \frac{6}{s} \\ s\,Y\left( s \right) - s\,y\left( 0 \right) + 9\,X\left( s \right) + Y\left( s \right) = 0...
  40. P

    MHB Alexander's question via email about Laplace Transforms

    The Heaviside function suggests a second shift, but to do that, the entire function needs to be a function of $\displaystyle t - 4$. Let $\displaystyle u = t - 4 \implies t = u + 4$, then $\displaystyle \begin{align*} \mathrm{e}^{5\,t} &= \mathrm{e}^{5\left( u + 4 \right) } \\ &=...
  41. P

    MHB Dharshan's question via email about a Laplace Transform

    $\displaystyle \begin{align*} \mathcal{L} \left\{ 5\sin{ \left( 11\,t \right) } \sinh{ \left( 11\,t \right) } \right\} &= \mathcal{L} \left\{ 5\sin{ \left( 11\,t \right) } \cdot \frac{1}{2} \left( \mathrm{e}^{11\,t} - \mathrm{e}^{-11\,t} \right) \right\} \\ &= \frac{5}{2} \,\mathcal{L} \left\{...
  42. D

    Other Contacting a possible graduate adviser with this email

    Below is an email that I am planning to send to someone that I would very much like to work for as a graduate student. Are there any red flags I should avoid? Anything else in particular I should mention? Thanks in advance. Hello Dr. [REDACTED], I am an undergraduate physics major (junior)...
  43. S

    Can email spammers disguise the origin of their messages?

    Can email spammers alter email headers so that we can't find out which internet service provider and mail server originates their messages? Sometimes emails sent from a reputable ISP get temporarily blocked by some servers due to complaints about spam originating from the ISP. The sender is...
  44. A

    Alternative Email Services to Gmail

    I'm about done with my mini-vacation posting flurry, but before I get back to work I want to ask one question which may be of interest to lots of forum members. I no longer use Google for search, relying instead on DuckDuckGo. I also have the Tor browser, which I use for logging into my free...
  45. Y

    Problem logging onto sbcglobal.net email

    Hi, I have a strange issue, I cannot log into my @sbcglobal.net email on my laptop. I know the password, we have no problem logging in on another computer, just my laptop. I tried using IE and Google Chrome ( going to Yahoo), both kept saying the password or email address are not valid. I tried...
  46. astroman707

    Anyone know how to filter out conversations in gmail?

    I get a ridiculous amount of gmail every day from my college's student body, but 95% is just students flooding the emails with nonsense ' forum bump' type responses and it's a chore to try and check my emails. --Does anyone have any idea how to filter out or mute responses to future emails?--...
  47. starstruck_

    Other The science in my email to a prof

    Hey! I’m writing an email to a professor for research and I am mentioning some things I’ve found interesting and trying to connect them to his research but I’m not exactly sure if I’ve gotten the gist of these topics right ; like for example if dark matter and stuff effects the structure or...
  48. jtbell

    Phishing Scam Alert: PayPal Email with Suspicious Links

    Today my wife received an e-mail, apparently from PayPal, notifying her that a payment was being made from her PayPal account for a purchase of about $30, and with a link to click if she wanted to dispute it. But... she's never opened a PayPal account. She was using iOS Mail on her iPad. As far...
  49. P

    MHB Erin's question via email about a Fourier Transform

    $\displaystyle \begin{align*} F \left( \omega \right) &= \mathcal{F} \left\{ f \left( t \right) \right\} \\ &= \int_{-\infty}^{\infty}{ f\left( t \right) \mathrm{e}^{-\mathrm{j}\,\omega \, t}\,\mathrm{d}t } \\ &= \int_{-\infty}^{-2}{ 0\,\mathrm{d}t } + \int_{-2}^0{ \left( 1 + \frac{t}{2}...
  50. W

    How to Obtain new Email, Forward to Previous one

    Hi All, I remember reading somewhere ( unfortunately can't remember the precise place) about some email program/service that would forward to it , emails from an existing account. Say I have Address1@mail1.com as an existing address. This service, with account , say Address2@mail2.com...
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