SMTP Relay Redirect to TCP/26

Question

I have three proxy servers (SMTP relay) that I want to put behind my F5's.  I will need to create an iRule to redirect SMTP to TCP/26 (SMTP relay servers are listening on TCP/26). I found some samples online and tried to create an irule (below) but it spat up an error.  Thanks in advance!&nbsp;
when SMTP_REQUEST {
    SMTP::header replace Host "[SMTP::host]:26"
}&nbsp;

boneyard · Answer

did you just take HTTP::header and HTTP::host and change HTTP to SMTP?&nbsp;
unfortunately it is not that simple, see for example here: https://devcentral.f5.com/questions/adding-x-header-to-smtp&nbsp;
you will need to work with TCP::payload to modify the data.&nbsp;
but wouldn't it work to just have the virtual server listen on :25 and the pool members on :26?&nbsp;

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SMTP Relay Redirect to TCP/26

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