hi
I have the same question:
On 02.07.23 21:45, Colin Jack via Blueonyx wrote:
Hi Michael,
2.) Enable and configure SPF and switch it to "Sign & Verify" mode
This checks the SPF records of sender domains and if the senders
IP is not within the SPF records published by say hotmail.com, then
the
Hi Michael and Ken,
Colin: Do you by chance have a mail relay in front of your BlueOnyx that
forwards the inbound emails to the BlueOnyx. Because *that* could be the
problem.
That is actually a very valid point.
I need to check through the effected domains and see whether they are using a
Hi Michael,
2.) Enable and configure SPF and switch it to "Sign & Verify" mode
This checks the SPF records of sender domains and if the senders
IP is not within the SPF records published by say hotmail.com, then
the email will be rejected at the MTA w/o bounce and NDN.
This may be a doh! questio
Hi Ken,
Are you using some sort of MX relay to do email filtering, so
> that by the time your BO server rejects the connection for no valid
> recipients, the outboard solution has already terminated its SMTP
> session and sends a bounce email? Otherwise, I don't see how an SMTP
> reject would
Hi Michael,
> We are having issues with spammers sending thousands of emails to
> non-existent users on our hosted domains and our BX server then bouncing them
> as "554 5.5.1 Error: no valid recipients" and our IP consequently getting
> blacklisted for backscatter.
>
> Microsoft hate us no
Wait, that's an SMTP error code, is your server rejecting the email during the
SMTP session, or sending a bounce email to the (probably spoofed) sender? It
should be doing the first one. The second one is bad, I think the term is
asynchronous bounce?
Are you using some sort of MX relay to do
Hi Colin,
We are having issues with spammers sending thousands of emails to non-existent users on
our hosted domains and our BX server then bouncing them as "554 5.5.1 Error: no
valid recipients" and our IP consequently getting blacklisted for backscatter.
Microsoft hate us now – Hotmail etc.
We are having issues with spammers sending thousands of emails to non-existent
users on our hosted domains and our BX server then bouncing them as "554 5.5.1
Error: no valid recipients" and our IP consequently getting blacklisted for
backscatter.
Microsoft hate us now – Hotmail etc. and block
