Big mail issue two ip address

Posted by Luka on Server Fault See other posts from Server Fault or by Luka
Published on 2012-11-21T02:31:11Z Indexed on 2012/11/21 5:03 UTC
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I have two ip addresses on my server, First IP is assigned to my clients, second is assigned to me. Issue started today. My clients can not send mail via php from their ip address (shared ip address which are all of them using). Server is refusing it with error ERROR: Password not accepted from server: 535 Incorrect authentication data

But via their desktop mail clients it can send mail, when they use my ip address for hostname (second ip of server assigned to me) they can send mail. help.

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