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docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
I really like https://github.com/docker-mailserver/docker-mailserver you can simply disable everything you don't need (clamav, spamassassin)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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inbucket
Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.
https://inbucket.org/ is very easy to host, does not require you to setup mailboxes, does not require any sort of database, has a built in webmail interface, and you can also grab via POP3 if you want to use a traditional mail client.
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I found https://github.com/mailhog/MailHog for SMTP to and Webinterface and https://poste.io/ for easy mailserver.