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SMTP Relay for monitoring - custom domain (lemmy.world)

submitted 1 year ago by thejoker8814@lemmy.world to c/selfhosted@lemmy.world

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Hi there,

what SMTP relay's / services do you use or can recommend for sending monitoring alerts.

I'm running a few services, but mostly all my custom scripts, and tasks are configured to sent an e-mail if something goes "off-script". Before I used my gmail account - but I'm in the middle of migrating away, and my requirements have evolved.

I've searched but I haven't found anything good. Services like Mailgun, Mailtrap etc. are nice - but their bundle's are a bit much for my taste.

The service/ relay should meet the following requirements.

bring your own domain (use your own domain/ or sub-domains as sender address)
must have DKIM (anything else is not a serious service!)
support SMTP via TLS
support multiple SMTP clients, with each different credentials/ secrets
Allow custom header/ envelope changes

At the moment I'm looking at Amazon SES, because I don't expect a lot of messages (I had 3 alerts in the last 1,5 yrs).

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[–] thejoker8814@lemmy.world 1 points 1 year ago (1 children)

My bad, I meant SPF record.

I have some issue with just that, all emails will end up in a spam filter (if your mail provider is thorough). Also your IP might end up on a public spam/ block list. To much to go wrong, in case some alerts need to reach me.

Plus I use a strict DMARC, so at least a correct SPF is needed.

I’m using postfix on my machines, all services send to it and it just to relays via a SMTP service. So only one point to configure.

I was specifically looking for the last part, a SMTP relay service.

[–] wgs@lemmy.sdf.org 1 points 1 year ago

As you please ;)

Be aware that I've been doing that for all my servers for the past 5 years and it works like a charm. I run OpenBSD, and only need to rcctl start smtpd to start sending outbound emails.

They're all sent from "root@host.domain.tld", which have neither SPF nor DMARK records, and end up in my inbox no problem (I use spamassassin as my spam filter). They won't end up on Blocklist as the volume is just waaayyyyyyy too low anyway.