Austin Witmer via Postfix-users:
> Hello all!
>
> I recently added mlmmj as a mailing list manager to my postfix server.
>
> My concern is that I don't overwhelm the big boys (yahoo, google,
> iCloud) and have them rate limit me because I am sending to too
> many addresses to quickly.
>
> Here are my transport settings for mlmmj.
>
> mlmmj_destination_concurrency_limit = 5
> mlmmj_destination_concurrency_failed_cohort_limit = 10
> mlmmj_destination_rate_delay = 1s
> mlmmj_destination_recipient_limit = 1
Caution: with mlmmj_destination_recipient_limit=1, the unit of
concurrency is the recipient address, not the domain name. Postfix
will deliver up to 5 recipients in parallel assuming that your SMTP
client process limit is 5 or more.
> Are they sensible? Am I being overly cautious? Any suggestions for
> improvement? I have one mailing list I am setting up with over
> 1500 subscribers and so I want to get this right.
You will need SPF, DKIM, and DMARC with 'p=reject'. If this is
an interactive list, you will need to replace list member's From:
headers with your mailing list address to satisfy DMARC.
You will need to start slow, and increase delivery rates in the course
of ~weeks.
Wietse
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