SMTP log shows garbage after user name, can't log into server
I just changed mail servers (my old private server is at least a decade old), and am now using a new server and a new point release of Sendmail. Suddenly my mail sending no longer works, I can receive fine, but I cannot send. Enabling smtp level 5 logging on Thunderbird shows that my user name as transmitted to the server is incorrect: I specified charles as the user name, and what the log reports is being sent to the server is charles@xxxxxx where the xs represent random characters, different each session, ranging from 0x0f up to apparently 0xe3. Changing my name to charlesw, which is of course not going to work, results in the same seven characters appended to the name, so charlesw@xxxxxx.
Thunderbird release 38.7.1 on Windows 7 x64. SMTP set to use STARTTLS on port 587, normal password.
Any idea what's going on and how I can fix it?
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Some additional information:
Reading mail is fine (connected via IMAP). TBird recognizes that it's a new server and has re-downloaded all of my messages. IMAP is using STARTTLS and normal password over port 143 with no difficulty. I have not logged what TBird is doing on IMAP because it's working.
From my home network, sending works fine, but I am connecting with no authentication and have set a relay without authentication rule for that network in sendmail.
TBird has not updated between when it worked on my old server and when it stopped working on the new one.
Modified