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There are other options besides running a fully blown internal mail server. You could try https://github.com/maildev/maildev or https://github.com/mailhog/MailHog (no longer being developed but still working great) if it is enough for your use case.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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There are other options besides running a fully blown internal mail server. You could try https://github.com/maildev/maildev or https://github.com/mailhog/MailHog (no longer being developed but still working great) if it is enough for your use case.
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inbucket
Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.
I run https://www.inbucket.org/ at home. I wrote it, so I'm biased, but it works well for me. ;)
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docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
I do this. I run docker-mailserver on the same docker host as my other containers, and connect it only via the internal docker network to those containers that need it. It has no externally exposed ports, since it doesn't need to send or receive mail beyond the LAN. Roundcube provides the only UI for users to access their mailbox for account verification, password resets, etc. I use it to teach my young kids email before they're ready for the real deal. It's worked well so far.