There are several SMTP server solutions for OpenVMS.
HP TCP/IP Services for OpenVMS (nee UCX) has one. Commercial offers include PMDF by Process (I believe they also offers hobbyist licenses), CommuniGate Pro (IIRC, there's a Community License for at most 5 users), and Quintara by Brilliant (which is commercial only, AFAIK).
This is described in the TCP/IP Services documentation which resides at http://h71000.www7.hp.com/doc/tcpip57.html. Choose the version you're running (get it via $ TCPIP SHOW VERSION), open "HP TCP/IP Services for OpenVMS Management", and find the chapter titled "Configuring and Managing SMTP".
malmberg December 12 2017 HPE only makes the most current version of OpenVMS Alpha / IA64 /VAX available to hobbyists. When I had access to the Alliance 1 program it was the same. No public downloads are allowed by HPE.
nmbonao December 08 2017 Is anybody knows OpenVMS 8.2 version downloadable version? or CD copy? Thank you very much
aarommes December 02 2017 Bitcoin and Blockchain enthusiasts ( plus distributed computing ) please connec / reply: http://www.openvmshobbyis t.com/forum/viewthread.ph p?forum_id=130&thread_id= 2991
malmberg September 10 2017 https://sourceforge.net/p /vms-ports/wiki/VMSInstal lation/ For the most part just use VMS 6.1 media instead of 7.3. But why run the older release?
DoeveR August 07 2017 Where can I find the write up on running VMS 6.1 using the simh emulator?
Bart March 20 2017 Happy to have found my password again!