I’ve had a Mail-In-A-Box instance installed at box.mydomain.com for a short time (couple months?)
The site is secure as far as I can tell, and it has only been used very little to send and receive a few emails.
Today I was trying to send FROM an email at email@example.com and I could not send at all because of the SpamHaus listing (which appears to be new) blocking me from sending.
Here was the error message:
SMTP Error (554): Failed to add recipient “@.******)” (5.7.1 Service unavailable; Sender address [firstname.lastname@example.org] blocked using dbl.spamhaus.org; https://www.spamhaus.org/query/domain/mydomain.com).
I tried sending TO other email addresses and had the same problem.
The SpamHaus link says:
This listing may be caused by poor sending reputation, or the domain or website may have been hijacked by cybercriminals.
As a result, the domain is listed in the Domain Blocklist (DBL)
Click on Show Details to see if you can request a delisting from this blocklist. This will also display any further information we have relating to this listing.
I ran a malware check on my site and made sure the server could only be signed into with a public/private key combo.
I have seen ZERO sign that this server or site has been hacked in any way.
The other domains I have as sending domains on my setup appear to be working fine.
So… I went ahead and requested delisting at SpamHaus which created a ticket and I am waiting to hear back from them.
In the meantime…
Anybody know what is going on? What would be causing this on a relatively new server and site with very little use?
How do I turn OFF the spamhaus blocking function inside my mailinabox setup so I can use it in the meantime? Right now ALL sending from the main domain is being blocked.
I look forward to the help of this community which I have been grateful for before.