Ruby on Rails

> On Dec 29, 2019, at 11:44 PM, fugee ohu <fugee279@gmail.com> wrote:
>
> I searched my entire tree starting at / for the name of my mail server but didn't find it Everything's working it sends mail in production just fine but I'm trying to figure out how, since it seems I never put the url of my mail server anywhere?

Your production server may be set up with postfix or sendmail, and thus the default (SMTP to localhost) will Just Work™. When your application sends mail, it just sends a raw SMTP message to port 25 on the localhost, and the mail server running there accepts it and forwards it. That's the default, baked into Rails, in case you don't configure anything more specific.

This is almost never what you actually want, because unless your production Web server is also set up as an authoritative (DNS-verified) SMTP server, your mail delivery will be spotty at best to large (think Gmail) recipients. Those services take spam very seriously, and you have to climb over some tall fences (configured in DNS, mainly, through TEXT and MX records) in order to please them enough to accept your messages.

This is doubly-true if your application is designed to send mail that is "apparently-from" someone who is not at your server's domain. Services like SendGrid exist to take this pain away from you, making sending transactional e-mail as pain-free as possible, because they work to ensure that their servers don't end up on banned lists, or get off them quickly.

My recommendation if you want to send mail out to one user that appears to be from another user, such that they can just hit "reply" in their mail application and respond to it, send the message with the headers From: a-real-address@your-server.com, and Reply-to: user@example.com. That way the message is deliverable (since it came from you, and you authenticate that in your DNS settings), but the recipient can simply press Reply and not have to manually correct the To: address in that message.

Walter

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