I got the port 465 for smtpmail-smtp-service from KMail; with KMail I
can send mail from this account.  KMail has a configuration function
that check what kind of authentification the server supports, and for
this account it says the server supports SSL encryption and either LOGIN
or PLAIN authentification, and it changes the port from 25 to 465.
Since the smptmail manual says LOGIN authentification is supported, and
since it works with KMail, I do not understand why it fails with Gnus.
Have I failed to set a necessary variable?  Is there another way to send
mail with Gnus via an SMTP server?  I would be grateful for any help.

Steve Berman

PS: As a sanity check, I also tried with the default port 25, and after
a few minutes the transmission attempt broke off with the message
"open-network-stream: make client process failed: connection timed out,
:name, SMTP, :buffer, *trace of SMTP session to mail.myprovider.com*,
:host, mail.myprovider.com, :service, 25"

PPS: I had first tried the above setq except for not setting
smtpmail-smtp-service, but including 465 smtpmail-auth-credentials.  But
with this I got the same result as reported in the above PS, including
":service, 25".

PPPS: I have another email account with which I can send mail using Gnus,
with a setup parallelling the above, except that the port in this case
is indeed 25.