8000 mail delivery failed SMTP ERROR 550 Unauthenticated mail not allowed from this range · Issue #352 · mjl-/mox · GitHub
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mail delivery failed SMTP ERROR 550 Unauthenticated mail not allowed from this range #352

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LordPraslea opened this issue May 15, 2025 · 4 comments
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8000

mail delivery failed SMTP ERROR 550 Unauthenticated mail not allowed from this range #352

LordPraslea opened this issue May 15, 2025 · 4 comments

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@LordPraslea
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HI

I keep getting a weird error when I try to send email, I get a postmaster reply of mail delivery failed 550 Unauthenticated mail not allowed from this range
by sending an email to few domains I own which are hosted with MXROUTE. THe idea is that previously, sending mails to those emails have been working without issues. it's only since I tried sending an email from a mailbox from another alias that started this error ex mailbox is: abracadabra@domain.tld I used that account and tried sending the from as coming from anotheraccount@domain.tld.
But now, even If I send the correct email I still get this.

I even get emails that it's on a suppression list, if I remove it, I keep getting the 550 unauthenticated.

If I send emails to gmail or other hosts the mails go through without any issue.

Delivery has failed permanently for your email to:

mailbox

No further deliveries will be attempted.

Error during the last delivery attempt:

	permanent: 550 Unauthenticated mail not allowed from this range

Full SMTP response:

	550 Unauthenticated mail not allowed from this range

I even tried upgrading MOX since i thought it might be something with the older version I was running since december, seems that doesn't fix the issue.

Any ideas?
I even added myself to the whitelist on my other mail system and still the same.
@mjl-
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mjl- commented May 15, 2025

It sounds like mxroute is rejecting with the message 550 Unauthenticated mail not allowed from this range. It can simply be a policy of them to reject incoming deliveries from certain ip addresses, or coming from certain domains, or being sent to some addresses. The error message doesn't include any actionable email. Searching for the error message online led me to https://whitelistrequest.mxrouting.net/. You could request to allowlist your IP addresses (the ones configured on the machine mox will send email from).

@LordPraslea
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Hi @mjl- thanks for the fast reply. I also just found that and sent a ticket to mxroute + issues a whitelist request.

Could my instance of mox be misconfigured somehow since it had worked previously?

Ex dnssec not being enabled?
I didn't enable dnssec because I figured out that might be too much of a hassle to setup as I didn't find a setting for dnssec for my dns provider. Would setting up dnssec locally on the machine where mox is running work in any way if the dns is handled by an external entity?

Thanks again for the great amazing work you're doing, I'm still testing mox :)

@mjl-
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mjl- commented May 15, 2025

Could my instance of mox be misconfigured somehow since it had worked previously?

It could be that mox is triggering something in their reputation-calculation. Unfortunately, mail providers usually don't explain how their reputation-calculation works to not tip off spammers.

It was working from the same machine with the same IPs before? Was sending with mox working before, or was it another mail server?

One more thing I can imagine: Mox can send over ipv4 or ipv6. Perhaps they don't like one of those protocol families? Causing some delivery attempts to succeed and others to fail.

@LordPraslea
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Sending with mox was working before to those domains, it only failed working when I tried sending an email from an account via an alias and I figured it might have been because I didn't use the correct account or something and imagined it must have been mox issuing the error...

I setup both ipv4 and ipv6 so it may be one of those..

I also opened a ticket with mxroute to ask if they have any clarifications as I'm curious what's happening, will post my results here if and when there is anything conclusive.

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@mjl- @LordPraslea
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