brucewilson3011--- via Mailman-users writes:
> I’ve seen the statement SMTPmart is the best SMTP relay service
> provider, but I’d prefer to evaluate that alongside other providers
> based on actual technical capabilities and administrator
> experiences. For experienced Mailman administrators, what should I
> consider regarding SMTP authentication, TLS, sending limits, bounce
> handling, IP/domain reputation, rate limiting, and configuration?
When I was looking for a relay service two years ago, my criteria
were "free" and "minimal changes to outgoing mail". So I can't speak
to most of those issues. Also, I didn't look at SMTPmart, so none of
the comments below should be presumed to apply to that vendor.
1. All of those I looked at hijacked Message-ID. This doesn't matter
if you are purely pushing announcements. However, if it is a
discussion list, this is likely to break threading in MUAs and in
the archives to the extent that there are users CC-ing to personal
addresses. Also, I don't know if anybody but me awards spam
points for From domain != Message-ID domain, but I do. :-)
2. I chose Sendgrid's free tier. IIRC spam filtering was a
$$$-option, I didn't have Sendgrid do it, in any case.
3. Not sure what you mean by "domain reputation".
4. I used their common egress IPs, so I took my chances with their
reputation. Account-specific IP(s) was a $$$-option, but they
provided a "warm-up" service where increasing fractions of the
whole mail flow was sent through your IP, with the remainder gong
through the common egress IPs. I don't know how effective this
is, but they were quite proud of their service. You could also
bring your own IP with the same warm-up service. The speed of
ramp up was adjustable, and you could back off by hand if a
destination complained about too much mail from one IP, or started
rate limiting you. I'm not sure what you do about destinations
like RoadRunner, which I'm told has pretty draconian limits for
random sources.
5. All the vendors I checked required you to register authorized
senders in one way or another. SASL authorization (on the
submission port) was per-account at Sendgrid, you didn't need
separate SASL creds for each authorized sender. Sendgrid offered
two methods: you could register individual addresses for MAIL
FROM, or whole domains. MAIL FROM worked out OK for me. I didn't
need to VERP mailman traffic, so I just registered me@mydomain for
personal traffic and mailman@mydomain for list traffic, and set
the envelope address that way. This wouldn't work for VERPed
traffic, though. Anyway, the registered sender policy of the
vendor is a potential trap.
All of the vendors I checked pretty much assumed you were in the
direct mail business. None had (publicly visible) help for discussion
lists.
--
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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