heyy im trying to make a good mailcow server in DigitalOcean.
can someone tell me a bit more about mailgun and sendgrid? idk what they are for and what they do? (this will help alot) Thank you!
EnglishMailgun and Sendgrind, What are they for?
These are providers for a Mailrelay or Smart host: Smart host - Wikipedia
en.wikipedia.org
If your provider e.g. blocks port 25 which is necessary to send emails to another mailserver you either need a relay or ask the provider to unblock said port.
Mailrelays are also used to send bulk mails (Newsletter) because they have a good IP reputation
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