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- Thu Feb 08, 2018 8:16 pm
- Forum: Mail Server
- Topic: Can not Send email - 550 Access denied - Invalid HELO name
- Replies: 11
- Views: 42844
Re: Can not Send email - 550 Access denied - Invalid HELO name
I experienced the same error message. After little investigation I have found that the user was logging in to the web mail client (Roundcube) trough the IP address of the mail server instead of logging in trough the DNS name. In such case, roundcube is sending the IP address as part of sender name i...