Check if your ISP has an SMTP service. I use mine for alerting when stuff breaks and haven't had any issues. If you use your own domain name and have trouble with delivery, you could try setting up SPF.
this post was submitted on 19 Nov 2023
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.test internal domain, own postfix SMTP+dovecot IMAP server.
The IMAP server is accessible from WAN via IMAPS (HAproxy+SSL/letsencrypt certificate).
As per securing against brute force attacks:
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Dovecot has a listener process configured to talk the HAproxy's specific PROXY protocol which passes the original client IP to Dovecot, so the latter can apply its own authentication penalty algorithm
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Crowdsec is installed with the HAproxy plugin, so client IPs can also be banned after authentication errors, albeit I'm not sure this works with HAproxy's PROXY protocol
Sendgrid, Sparkpost, SES, plain gmail.
If you're only sending emails to yourself, gmail works well with no cost.
Are you sending lots of mails to a large group of users. If not why not use any normal e-mail service like gmail?
Strato
A bit overkill but mxroute. Complete own Mail-environment for sending and receiving.
About 50.- a year I think it was
Check for Black Friday deals at mxroute. I signed up last year for $10/year.
Nothing at all.
I selfhost ntfy and services that only support email for notifications send them to ntfy smtp, then ntfy turns them into a push notification.
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Mailjet. Free for 6000 emails/mo, which for me is plenty to cover backup notification, monitoring system notifications, etc.
MailJet
I use duocircle.com, allows.dkim and spf. 1,000 per month for free. Gives a warning at 800 and 900 - helpful when I have a process run a little amok.
Emails? Emails? I don't need no stinkin' emails.
Apologies to treasure of the sierra madres.