CLIENT -> SERVER: MAIL FROM:SERVER -> CLIENT: 250 OK Sender okCLIENT -> SERVER: RCPT TO:SERVER -> CLIENT: 550 No such user hereSMTP ERROR: RCPT TO command failed: 550 No such user hereCLIENT -> SERVER: QUITSERVER -> CLIENT: 221 Service closing transmission channelConnection: closed2019-07-16 18:17:35 SMTP Error: The following recipients failed: spottest-BackupMX@mydomain.net: No such user hereMessage sending failed.
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