Some emails wont send

[Kabaki]

Some emails wont send on my Outlook. It gives error:
451 Dynamic/Residential IP range listed by NJABL dynablock -
http://njabl.org/dynablock.html
The email addresses am sending to are valid and verified. What is the problem?

 

[Brian Tillman]

Some emails wont send on my Outlook. It gives error:
451 Dynamic/Residential IP range listed by NJABL dynablock -
http://njabl.org/dynablock.html
The email addresses am sending to are valid and verified. What is the
problem?

This appears to suggest you're bypassing your ISP's SMTP mail router or that
your ISP's SMTP server requires you to log into the POP server first before
sending mail. Ask your ISP exactly what options for sending you must
configure. Make sure' you're properly authenticating to the outgoing
server. Try enabling the "Log on to incoming server before sending mail"
option in your account properties.