Is there some compelling reason that you wish to avoid using your ISP's server? If not, I'd just set up the smarthost for all outgoing mail and be done with it. It will save you many a headache as ...

Ah, sendmail. You either love it for being so versatile and ubiquitous, or you hate it for being bloated, complicated and insecure. Or perhaps you're a complete newcomer to the e-mail server game and ...

We are using Starlink in a remote place, which does not provide a SMTP relay server like our old (slow) cable modem ISP. A family member uses an email service she does not want to move away from that ...