RealSender | dedicated smtp server
RealSender.com offers an online check tool
to validate your SPF settings sending an email message:
1. send an email to firstname.lastname@example.org
2. check online the SPF validation results
(it will take a minute to appear)
During verification, a prefix is added to the subject
if the message is not authenticated correctly.
RealSender.com promotes the limit
on the number of recipients per message, to reduce
the risk of sending cc/bcc to many addresses.
We share a list of 300 @spam-box.com addresses for testing.
The messages will reach a "black-hole" mailserver.
You can use them at your convenience
to check how many recipients per message
your smtp server allows the sending.