troubleshooting Question

Mail Rejected: SMTP Authentication

Avatar of AbdulBasith Syed
AbdulBasith SyedFlag for Saudi Arabia asked on
Exchange* SMTP
8 Comments1 Solution180 ViewsLast Modified:
I had this question after viewing exchange external email repeatedly blocked/undelivered.

i have a similar issue. my exchange was working good fro past 3 years , but now from past few weeks we are getting rejection messages

Please turn on SMTP Authentication in your mail client. []:35454 is not permitted to relay through this server without authentication.
A problem occurred while delivering this message to this email address. Try sending this message again. If the problem continues, please contact your helpdesk.

i am unable to find out the reason for this. I tried using a new send connector with smart host and basic authentication. before i was using send connector with MX
AbdulBasith Syed
IT Manager

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