Your own mailing system (most easiest to use with zero configuration) for the entire world (available in almost all the languages of the world) which will include Mail User Agent and Mail Transfer Agent thus trying to give maximum speed while transferrin
Deploy in 115+ regions with the modern database for every enterprise.
MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
Virtual Qmail - virtual domains management system for qmail. It is designed to be fast, reliable, and easy to use. Includes software allowing users to manage their accounts via WWW.
dspam-filter is a filter to invoke the anti-spam tool DSPAM directly from the embedded maildrop in vpopmail via dot-qmail forwarding. DSPAM masquerades as the email server's LDA. However most users of Qmail prefer to leave the qmail-queue intact.
TLim (Transaction Limiter)
TLim is a patch that spam-hardens sendmail against both inbound and outbound abuse.
TLim counts the number of transactions an IP performs. Should the IP violate admin-defined limits, it is sanctioned via a null route.