Paul B. Gallagher wrote:
Frog wrote:

I am not able to send e-mail messages for some reason (Windows 7).  This
problem started yesterday at noon and continues at this time. All other
internet actions are normal.  I called my ISP for help and I thought the
problem was resolved---he installed a temporary browser on my system and
it was able to send messages to my carrier.  I thought all was well at
that point---it was not as I cannot send messages from either SeaMonkey
or Thunderbird.  I next tried to send a message from my laptop (Windows
XP) using SeaMonkey and then Thunderbird and that does not work either.
  My amateur fix-it skills tells me that my problem may be located at my
ISP.  What should or can I do to fix this send message problem?

If different computers and different programs are affected, it's probably not the computers or their settings -- unless they both installed the same update.

It's most likely some change to your ISP's SMTP configuration or settings. For example, they may suddenly require a different form of security or authentication than they did before. Ask the tech to specify all the settings they currently require for OUTgoing mail (SMTP):

• Server name (make sure spelling and punctuation are exactly correct)
• Port (three-digit number such as 465)
• Connection security (None, STARTTLS, SSL/TLS)
• Authentication method (None, normal password, encrypted password, Kerberos/GSSAPI, NTLM, Oauth2) • Username (usually your full email address, but some ISPs prefer just the prefix)

These settings can be found at Edit | Mail & Newsgroups Account Settings | Outgoing Server (SMTP), at the very bottom of the list of accounts. Choose your SMTP server and click "Edit." Click "OK" when done to save the new settings, or "Cancel" to discard them.

If they offer a choice between tighter and looser security, ask for the settings for tighter security; it's better for your privacy.

If you use two or more SMTP servers, make sure each of your mail accounts points to the correct one (some ISPs accept mail only from their own subscribers). Under Edit | Mail & Newsgroups Account Settings | <Account Name>, select the Outgoing Server (SMTP) at the bottom of the dialog. As a test, you might also try switching to a different SMTP server to see if you can send mail through that one.

A temporary browser sending messages by webmail isn't a solution, it's a workaround. It doesn't use SMTP.

I think you have hit on what maybe wrong.  :)

A change in the security settings and SMTP port by my ISP rendered my send mail function useless one time. I think they made changes to make mobile devices sync or something, which I didn't need. I had to change my port number back to the old one, and everything was fine for me.
bj

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