On 2017-06-09 12:45:31 (-0700), Steve Jenkins <st...@stevejenkins.com> wrote:
I've got a Postfix server hosting a lastname.org domain name for family
members.
I use virtual aliasing to forward inbound mail for family members to
third-pary mail providers (mostly gmail, but a few yahoo and aol, too).
I've also created user accounts on the server for a very small handful
of immediate family members (4 people) so they can authenticate (via
TLS) send email as firstn...@lastname.org (which is properly DKIM
signed and will pass an SPF check).
I do not provide any mail storage or retrieval on the server (no POP or
IMAP) for any family members.
This has worked fine for years, but now I'm starting to see warnings in
the Postfix log from Gmail, stating that the server is being
rate-limited because of unsolicited messages. I presume that Gmail is
sensing SPAM being sent to the @lastname.org accounts, which gets
forwarded to the family member's Gmail account. I don't do any spam
checking or filtering on the Postfix server.
So my questions are:
1) What's the best way to forward family members' incoming mail to
Gmail (and other mailers)?
There really isn't any "best" way to do this. Reportedly, Google can
retrieve email over POP3 or IMAP. Perhaps you can set up accounts for
your users?
2) My Postscreen and main.cf sender restrictions are rejecting a fair
amount of inbound spam, but apparently not enough to keep Gmail happy.
3) Should I consider setting up SpamAssassin with some very low
thresholds to pick up the obvious stuff?
Yes. Google gets increasingly cranky if you relay spam to them and
ultimately your users will blame you when Google eventually files all
their mail coming from your server as junk.
But you really want users to pull mail from you. Unfortunately,
forwarding is no longer a viable option in the current world of email.
The spammers have broken that for everyone.
Philip
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Philip Paeps
Senior Reality Engineer
Ministry of Information
