Postmaster information
You are looking at a mail verification host operated by Senderbeat (p*.mx250.com, p*.rcpt250.com).
Who we are
Senderbeat is an email verification service. Our customers check that the addresses on their mailing lists exist before they send to them, which keeps bounces and complaints away from your server.
What this server does
It opens an SMTP session to the mail exchanger of a domain, sends EHLO, MAIL FROM and RCPT TO, and then QUIT. We never send a message: the session ends before DATA.
- We only check addresses our customers submit. To detect catch-all domains we may also test one random address on the same domain.
- Connections are rate limited per mail server, and we slow down further when a server answers with 4xx codes.
- Every host has matching forward and reverse DNS, SPF and DMARC, and the sender address accepts mail.
Opt out
If you don't want us to connect to your mail servers, email abuse@mx250.com with the domains or MX hosts concerned. We stop connecting to them within one business day. Rejecting our RCPT TO is also fine: we report the address as unknown and don't retry it aggressively.
Contact
Abuse: abuse@mx250.com · Postmaster: postmaster@mx250.com, postmaster@rcpt250.com