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Configuring fetchmail to deliver to Zimbra with custom header added

I needed to fetch mail from a POP3 account and deliver it to a Zimbra account. Because I’m doing this for multiple POP3 accounts, I want to add a header which I can use in Zimbra to filter. This is what we made:

poll server user "user" pass "secret" mda "formail -A 'X-Zimbra-To: user@domain.org'| /opt/zimbra/postfix/sbin/sendmail -i -t service@sicirec.org"

The -i tells sendmail to ignore a single dot on a line, because that would normally mean end of mail. The -t is “to” (not the header “To:“).

It is a bit unclear why postfix delivers locally to Zimbra, since doing mail user@ourdomain.org routes through an external SMTP server, which is configured in Zimbra to be used as MTA for outgoing mail. It is configured as ‘webmail MTA’.


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