[GTALUG] Updating my mailserver

[Val Kulkov]

On Mon, 31 Aug 2020 at 22:13, William Witteman via talk <talk at gtalug.org>
wrote:

> I have run a mailserver for my domains for a long time.  I have not
> thought about its ability to send outbound mail for a while though,
> and my logs tell me what my experience already suggested - it cannot
> send email to Gmail (and probably lots of other places).
>

If you want your outbound messages to reach Gmail users, you need to send
authenticated messages and your reverse DNS must be set up correctly:
https://support.google.com/mail/answer/81126

If you can't set up reverse DNS on IPv6, disable IPv6 in your Postfix
configuration. Gmail will reject your messages that are sent over IPv6
unless you have the reverse DNS working correctly for IPv6.

In my experience, if you acquire your IP address from a pool of addresses
at your ISP over DHCP, your outbound messages will most likely be doomed as
suspected spam. You need to have a static IP address that is not
blacklisted: check out http://multirbl.valli.org/
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