[Info-vax] "SEND MAIL" doesn't send mail, mail stays in queue

[Stephen Hoffman]

On 2018-01-22 21:54:46 +0000, Phillip Helbig (undress to reply said:

> I've been running SMTP at home...

Whether a particular ISP or mail relay provider allows relays or allows 
not-TLS connections varies.   Whether a particular ISP allows outbound 
TCP port 25 also varies.  These and other security requirements only 
tend to tighten, too.   Then there are the more mundane changes, like a 
changed mail server host name as has happened with various providers.   
That's all ignoring the security problems inherent in the 
not-TLS-protected POP and IMAP and SMTP connections supported by the 
TCP/IP Server OpenVMS mail server, too; unencrypted client connections 
and cleartext credentials over potentially-insecure networks aren't 
very popular, and which can then mean that external and internal 
connections and (when necessary) a local relay to a 
not-directly-accessible OpenVMS through (for instance) a local Postfix 
/ Dovecot server.   To a more protected and isolated OpenVMS server.   
But I digress.   Check the server logs, see what errors are being 
produced.   And there's usually either a DNS problem around — DNS 
errors are almost typical for small network configurations and even 
some larger sites  — or it's an authentication or TLS-related problem 
connecting to the server, when the mail server is not playing well with 
other servers.



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