King0770-Notes-MTA-ALLOW-HELO

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One occasion external domains may not have valid resolvable hostnames for this helo-hostname; would see something like this.

mail.example.com #4.4.7 SMTP; 450 4.7.1 <srv004.xxxyyy8.com>: Helo command rejected: Host not found>

Update the MTA Config

Update the smtpd_recipient_restrictions.cf File

Edit the /opt/zimbra/conf/zmconfigd/smtpd_recipient_restrictions.cf file, and at very top of the file, add the following.

%%contains VAR:zimbraMtaRestriction check_helo_access lmdb:/opt/zimbra/conf/allow_helo%%

Create the allow_helo file

Run the following as the zimbra user (not root)

touch /opt/zimbra/conf/allow_helo

postmap /opt/zimbra/conf/allow_helo

Pick Up the Changes

zmconfigdctl restart

zmmtactl restart

Check it

zmprov -l gacf zimbraMtaRestriction | grep check_helo_access
zimbraMtaRestriction: check_helo_access lmdb:/opt/zimbra/conf/allow_helo   <<== You should see this

postconf | grep ^smtpd_recipient_restrictions
smtpd_recipient_restrictions = check_helo_access lmdb:/opt/zimbra/conf/allow_helo       <<== You should see this

Add entry to /opt/zimbra/conf/allow_helo file

srv004.xxxyyy8.com          OK

After updating /opt/zimbra/conf/allow_helo, run postmap against it.

postmap /opt/zimbra/conf/allow_helo
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