Show pagesourceBack to top Share via Share via... Twitter LinkedIn Telegram Yammer RedditRecent ChangesSend via e-MailPrintPermalink × Table of Contents Ports testing online tools This is an old revision of the document! SMTP Ports 25 SMTP 587 SMTPS 2525 non-standard port sometimes mirroring 25/587 testing https://mailtrap.io/blog/2016-07-26-how-to-test-smtp-server telnet mail.example.com 25 EHLO server.example.com MAIL FROM: <test@example.com> RCPT TO: <test@example.com> DATA online tools MX Toolbox MX Toolbox is a free service that will perform simple tests of: SMTP Reverse DNS Mismatch SMTP Valid Hostname SMTP Banner Check SMTP TLS SMTP Connection Time SMTP Open Relay SMTP Transaction Time However, you are not allowed to define the port, enter password etc. The number of tests is also limited. Wormly Wormly gives you a free trial to check your SMTP servers, but does not allow defining the port or password, a secure connection is also not available. SMTPer SMTPer is indeed the most convenient solution that allows defining the port, provides users with a secure connection and authorization. You also can fill out both sender and recipient forms. test-smtp.com Test SMTP simply sends requests to SMTP servers to perform Relaying tests. This service does not have a sufficient toolkit for a proper SMTP examination. testsmtp.tcsoftware.net Check SMTP works for certain parts of a process but isn’t enough for a proper examination. Does not provide a secure connection. Check SMTP will run the following tests: Check your server DNS Black List status Verify MX Records Relay Configuration PTR Record (Reverse Lookup) Verify Email Address Last modified: 2019-12-20 14:21