If you have problems with your server sending emails, usually a SMTP or DNS problem, this is it for testing.
Try to send 1 mail to the special single-use email given here, and it will analyse the results:
- Your SpamAssassin score & more important, its detailed scores (ex: “From abused NTLD” or “Untrustworthy TLDs”) … all of which can be arguable, but at the end, this is how remote servers see your emails …
- if your email or domain is blacklisted (more than 20 blacklisting servers tested)
- SPF, DKIM, DMARC
- if the content contents errors & how it is viewed
- the header
- the DNS used
and more
Privacy: we have no feedback of potential problem with this tool and author. But like many online services, you are here providing them with your own data. Depending of the criticity of your data, this is your responsibility to assess author's reputation and potential misusage, and to check and accept their terms and conditions, or not.
Free, No Download/Install required, No registration
