Cache for smtpd_recipient_restrictions????

[SysAdmin EM]

Hello, 

I would like to know if there is any way to implement cache for the smtpd_recipient_restrictions parameter?

I use MySql to store a table full of non-existent users, which I was saving from email accounts that have been compromised by viruses on the PC.

Any recommendation?

Regards,

[Noel Jones-2]

On 3/30/2021 8:17 AM, SysAdmin EM wrote:

> Hello,
>
> I would like to know if there is any way to implement cache for the
> smtpd_recipient_restrictions parameter?
>
> I use MySql to store a table full of non-existent users, which I was
> saving from email accounts that have been compromised by viruses on
> the PC.
>
> Any recommendation?
>
> Regards,

It's not clear exactly what you're asking for...
Please clearly explain the problem you're trying to solve for more
specific answers.

Postfix should automatically reject unknown recipients without
needing a specific list to reject, unless these are valid recipients
that should not receive mail.
http://www.postfix.org/ADDRESS_CLASS_README.html

If your SQL lookups are too slow, look into optimizing that. Using
the postfix proxymap interface can help by consolidating connections
to the database.
http://www.postfix.org/proxymap.8.html

A step further would be to periodically dump your SQL data to a cdb
database. These scale to millions of records with very low latency
and low resource usage.
http://www.postfix.org/CDB_README.html

Or switch to LMDB.
http://www.postfix.org/LMDB_README.html



   -- Noel Jones