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by hagbard_c
456 days ago
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As to sending through a reputable IP you can - and often must due to port 25 egress being blocked by the IAP - use a smarthost [1]. Outgoing mail traffic is proxied through the smarthost. This smarthost can either be run by your IAP (which turns them into an ISP in a way since they not only provide access but also services) or your can use one of the many commercial offerings. As to proxying incoming SMTP traffic you can setup a backup MX provider which accepts mail for your domain and forwards it to your own server. You can either keep your server online and receive mail in realtime or regularly poll the backup MX server for new messages, the latter used to be quite common in the days of dial-up internet access and can still make sense in case you're on a metered connection (4G/5G etc.) and want to skip the deluge of spam which, even though it get rejected at the gates still adds up to your traffic quota. [1] https://en.wikipedia.org/wiki/Smart_host |
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