Very nice. Comes with Roundcube so you've got a webmail client available. - DKIM signing on outgoing messages (opendkim). - The machine acts as its own DNS server and is automatically configured for SPF and DKIM (nsd). I remember many people running their own SMTP server used to have massive issues with their outgoing mail being silently or non-silently ignored or sent to the spam folder. Does this take care of this?…
I don't remember this ... can you elaborate ? Are you speaking of people who failed to disable relaying ?
Players like MailGun, SendGrid and Postmark provide such features as part of a EaaS product.