Webmail blocked sending email

[WildEnte]

@troypulk did you attach a very large file?

[edwardp]

@troypulk A 550 error is from the remote (receiving) server, indicating:

• 550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons)

It does reference ([email protected]:blocked)

Source

I've found other references to a 550 error, indicating the e-mail was either detected as spam, or contains unsafe content. If the e-mail you attempted to send was not spam or did not contain unsafe content, then it would appear that it was rejected for policy reasons.

[troypulk]

@WildEnte

No, it was just text.

[DoctorG]

@troypulk Could be that Vivaldi server IP is blocked by receiving server.
I try to ping a server admin to check your post here.

---

Checked smtp.vivaldi.net on blocklist providers. No block listed for Vivaldi mail server!

[troypulk]

@edwardp

Okay, Thanks.

I just sent the mail with my other non-vivaldi email service and it sent just fine.

It's not that important to chase this down and try to fix it, but shouldn't vivaldi webmail send email no matter who it's going to?

[troypulk]

@DoctorG

Thanks,

I can receive an email from the address [email protected] just fine, I just get the error when I try to reply to them.

[DoctorG]

@troypulk As being a server admin, i think that on receiver side the server spam filter going nuts.
Barracuda Central says smtp.vivaldi.net is a forum/newsgroup server.
And a dumb ultra-sensitive or AI filter on server acts because of this information: "Ouch, someone wants to send us spam. Block!"
Bad.

---

Can you send mail with content
This is a test! Please ignore.
to the receiver?

[troypulk]

@DoctorG Thanks,

Same thing, it was still blocked.

[DoctorG]

@troypulk Can you contact the [email protected] of the mail server and ask him why Vivaldi mail server is blocked?

[edwardp]

@DoctorG said in Webmail blocked sending email:

Barracuda Central says smtp.vivaldi.net is a forum/newsgroup server.
And a dumb ultra-sensitive or AI filter on server acts because of this information: "Ouch, someone wants to send us spam. Block!"
Bad.

If VBG is using Barracuda Networks for spam filtering, this is probably the reason why.

[Pathduck]

@edwardp Well, that's easy enough to find out

λ host -t MX vbg.com
vbg.com mail is handled by 0 d316892a.ess.barracudanetworks.com.
vbg.com mail is handled by 10 d316892b.ess.barracudanetworks.com.

Also this:
https://www.google.com/search?q="550+permanent+failure+for+one+or+more+recipients"+barracuda+networks
So it's definitely not just Vivaldi.

[edwardp]

@Pathduck Yes. I think Barracuda is using extremely strong spam filtering.

[DoctorG]

@edwardp said in Webmail blocked sending email:

Barracuda is using extremely strong spam filtering.

Barracuda is using extremely wrong spam filtering

[DoctorG]

A investigation with other users shows me now, that Vivaldi mail server is not blocked by vbg.com, it is the incoming Barracuda spam filter itself causing blocks by trigger words.

Sad. That means user who gets blocked can only send mail when not having this or that "bad" word in Subject or mail body.

[DoctorG]

@troypulk Please contact [email protected] and [email protected] and report them the issue with your blocked mails. Do not forget to send the the mail "This is the mail system" you got from vivaldi.net mail server, so vbg mail server admins can analyse. They are the correct address to check why their spam filters reject your mails!

We, and Vivaldi server team can not do anything to fix the reject of mails.

[DoctorG]

Barracuda is going nuts with other sending mail servers, too.
I wanted to send info@.... a description of the problem and they rejected mails from my company's mail server (and it has a good reputation), too.

<[email protected]>: host d316892a.ess.barracudanetworks.com[209.222.82.253] said:
    550 permanent failure for one or more recipients
    ([email protected]:blocked,[email protected]:blocked) (in reply to end of DATA
    command)

<[email protected]>: host d316892a.ess.barracudanetworks.com[209.222.82.253]
    said: 550 permanent failure for one or more recipients
    ([email protected]:blocked,[email protected]:blocked) (in reply to end of DATA
    command)

Crazy dudes! WFT!!!! Blocking access to postmaster@address is not mail standard compliant and violates RFC standards! How to complain in case of problems and security issues? Closing your postbox to outside? REALLY!? NOT!!!!!!!!

BAD!
Barracuda, you act like a meat mashing Piraña or some sort of US Reißwolf shredding mails!

[DoctorG]

Sorry for my harsh last sentences in previous post,
but such huge incompetence by Barracuda and vbg sysadmins let me become a angry firedragon.

[DoctorG]

Look Ma! Barracudas protects with AI.

Now, i know why the mails are rejected. AI protected. The new Snake Oil helping against All Odds!

[edwardp]

@DoctorG said in Webmail blocked sending email:

Crazy dudes! WFT!!!! Blocking access to postmaster@address is not mail standard compliant and violates RFC standards! How to complain in case of problems and security issues? Closing your postbox to outside? REALLY!? NOT!!!!!!!!

You will find this in RFC 5321.

It's incumbent upon VBG to contact Barracuda to fix this issue, end users shouldn't have to.

[DoctorG]

@edwardp said in Webmail blocked sending email:

You will find this in RFC 5321.

Yes, it says:

The reserved mailbox name "postmaster" may be used in a RCPT
command without domain qualification (see Section 4.1.1.3) and
MUST be accepted if so used.

It's incumbent upon VBG to contact Barracuda to fix this issue, end users shouldn't have to.

Yes. I only tried to check with postmaster@ if mail domain relies on standards.