When sending emails with my mailbox.org account, I occasionally receive errors like the following:
The mail system <xxxxxx@gmail.com>: host gmail-smtp-in.l.google.com[142.250.147.27]
said: 550-5.7.26 This mail has been blocked because the sender is
unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with
either SPF or DKIM. 550-5.7.26 550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass 550-5.7.26 SPF [bxm.at] with ip:
[80.241.56.151] = did not pass 550-5.7.26 550-5.7.26 For instructions on
setting up authentication, go to 550 5.7.26
https://support.google.com/mail/answer/81126#authentication
g4-20020a50d5c4000000b0056bf27dec57si5300544edj.105 - gsmtp (in reply to
end of DATA command)
Reason seems to be an error in my SPF/DKIM/DMARC setup.
I am using the mailbox.org mail provider with my own domains (in this case bxm.at), which are hosted
by all-inkl.com.
After looking into the documentation
of mailbox.org
and all-inkl.com, I added the
following DNS entries to the domain:
| Name | Type | Data |
|---|---|---|
| mbo0001._domainkey | CNAME | mbo0001._domainkey.mailbox.org. |
| mbo0002._domainkey | CNAME | mbo0002._domainkey.mailbox.org. |
| mbo0003._domainkey | CNAME | mbo0003._domainkey.mailbox.org. |
| mbo0004._domainkey | CNAME | mbo0004._domainkey.mailbox.org. |
| TXT | v=spf1 mx include:mailbox.org a ?all | |
| _dmarc | TXT | v=DMARC1; p=quarantine; rua=mailto:xxxxxx@bxm.at |
The configuration looks fine now:
Just for reference, these were the values before my change:
| Name | Type | Data |
|---|---|---|
| TXT | v=spf1 mx a ?all | |
| _dmarc | TXT | v=DMARC1; p=none |