Dual SMTP Server issue with Unicast Network Load Balancing

Posted by Igor K on Server Fault See other posts from Server Fault or by Igor K
Published on 2011-01-02T00:03:37Z Indexed on 2011/01/02 0:55 UTC
Read the original article Hit count: 252

Filed under:

iis

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email

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smtp

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nlb

Using two servers with NLB, each box contains IIS and a mail server. Server1 is the primary Server2 runs the backup mail server

The problem is the web app sends email to ourselves. When mail is sent from Server2 (via its own SMTP server) to ourselves, it tries to contact Server1, as its the mail server IP. But under Unicast mode of NLB, it cant reach the host via the public dedicated IP address.

How can we get round this?

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