This is an existing system, version 188.8.131.52. Recently, we are seeing intermittent voicemail-to-email sendmail failures with error:
“Recipient addresses must be specified on the command line or via the -t option”
I have tried both “/usr/sbin/sendmail -t -i” and “/usr/sbin/sendmail -t” for the sendmail path, same results.
All email recipients are in the same Office 365 domain; this functionality had been fine until the last couple of weeks. Again, this issue is intermittent; I may see several emails go out in the mail log, but then a few or dozens of this error. Apache logs no errors. Users confirm that they have not been receiving the emails consistently.
Any thoughts on what to look at on this issue are appreciated, thanks!