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All of a sudden users are not getting email notifications when new posts are added. Is there a way to troubleshoot this?

version 1.8.6 (1806)

Additional info.
Looked into the System mail log and saw this in the entries for the new posts:
The server did not understand the EHLO command

Clicking on the first post title link opened a page which had this:
SMTP Code: 550
SMTP Server Response: 550

Has anyone run into this before?