Menu
Reply
Gympie
  • 6
  • 0
  • 2
Tuning in
1,171 Views
Message 1 of 10
Flag for a moderator

Emails Bouncing

I get this Error Message when trying to send an Email:

550:550 Administrative prohibition - envelope blocked - https://community.mimecast.com/docs/DOC-1369#550 [mbhNXhU_Md6MJiKN9nU5pA.au73]

How can I resolve?

0 Kudos
Reply
MissPasko
  • 1.83K
  • 221
  • 970
Very Insightful Person
Very Insightful Person
1,156 Views
Message 2 of 10
Flag for a moderator
Helpful Answer

Re: Emails Bouncing

Hi - here are some questions to get us started:

These answers will help the more experienced community members give you some ideas on fixing the problem.


~ ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ ~

I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more

Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks

0 Kudos
Reply
BillC45
  • 1.67K
  • 207
  • 924
Very Insightful Person
Very Insightful Person
1,148 Views
Message 3 of 10
Flag for a moderator

Re: Emails Bouncing

See this -

https://community.mimecast.com/s/article/Mimecast-SMTP-5xx-Error-Codes-573763479

Basically, your target address uses Mimecast protection which is blocking the sending address or server.

Mimecast website says -

A 5xx error code is returned if the server has encountered a permanent error and the message delivery has failed. If you receive any of the errors listed below when sending a message to a Mimecast customer, contact the recipient's Mimecast Administrator. Mimecast can only deal with designated customer contacts.”

550

Administrative prohibition envelope blocked

The sender's email address or domain has triggered a Blocked Senders Policy or there's a SPF hard rejection.

Delete or modify the Blocked Senders policy to exclude the sender address.

 

Precisely how you “contact the recipient's Mimecast Administrator” when you can’t send an email to Mimecast is indeed a challenge!

How are you sending this email -

from VM Webmail using VM servers

from an email client using VM servers (which client?)

from a forwarding service using non-VM servers

- or what?

 

 

Gympie
  • 6
  • 0
  • 2
Tuning in
1,143 Views
Message 4 of 10
Flag for a moderator

Re: Emails Bouncing

Many thanks for your prompt replies.

My account is address@virginmedia.com

I am using Outlook, I have checked my settings and they are correct.

I have tried Web Browser and that also fails.

I pretty well understood the err message and also wondered how do I contact recipient when I am blocked.

 I was hooping to contact Virgin for them to take this up, but they also seem uncontactable,

Gympie.

0 Kudos
Reply
MissPasko
  • 1.83K
  • 221
  • 970
Very Insightful Person
Very Insightful Person
1,137 Views
Message 5 of 10
Flag for a moderator

Re: Emails Bouncing

If you know the recipient, or can get other contact information to let them know?  Telephone, text, whatsapp or even a letter or personal visit!  Or you could even use a different NON-VM email address?

For example - here is someone that is blocking ALL virginmedia.com addresses!

https://community.virginmedia.com/t5/Email/CEO-Fraud-Scams-Received-from-multiple-virginmedia-com-em...

You (and maybe the recipient) will probably want to find out if it is only your IP address (edit to add: sorry - not sure that is possible - it must mean VM's server IP address), your email address specifically, or the domain itself that is being blocked.


~ ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ *\o/* ~ ~ ~ ~ ~ ~ ~ ~

I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more

Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks

0 Kudos
Reply
Gympie
  • 6
  • 0
  • 2
Tuning in
1,129 Views
Message 6 of 10
Flag for a moderator

Re: Emails Bouncing

I have phoned them and advised but I don't think the person I spoke to considers it an issue to take it up. It is a rather large legal firm and I'm trying to send legal documents. if I could get in touch with their techie staff I might succeed, but the problem is at the recipients end,

Gympie.

BillC45
  • 1.67K
  • 207
  • 924
Very Insightful Person
Very Insightful Person
1,114 Views
Message 7 of 10
Flag for a moderator
Helpful Answer

Re: Emails Bouncing

The fastest resolution might be - open a Gmail account and send the mail via that route. 

It will be quicker than getting Mimecast to clear the block. 

Gympie
  • 6
  • 0
  • 2
Tuning in
1,089 Views
Message 8 of 10
Flag for a moderator

Re: Emails Bouncing

Thanks for your prompt support.

I have a gmail account but never use it for Emails. I logged into it and sent the error codes and attachment to the receiver via gmail. It hasn't bounced, I just hope the recipients take it up with their technical people.

undercoverhippy
  • 10
  • 0
  • 0
Joining in
768 Views
Message 9 of 10
Flag for a moderator

Re: Emails Bouncing

I've just started getting the same issue. Mimecast on my work account bounces emails I send from ntlworld.com. Same error - Mimecast error 550. I can see the internal Mimecast error code on my work email, as follows...

"These incoming messages have been blocked by Mimecast for security reasons. No data has been accepted for them and they can't be retrieved.

Rejection Type:13010Rejection Description:Envelope RejectedEvent Time:09/28/2020 at 03:38 PMRejection Information:Policy level block list in force"

I've tried sending from the virgin media web portal and from an iphone, and I've tried to 3 different target email addresses at my work. Mimecast rejects every combo.

This has only just started maybe last week. It does imply Mimecast is blocking ntlworld in its default policy.

0 Kudos
Reply
BillC45
  • 1.67K
  • 207
  • 924
Very Insightful Person
Very Insightful Person
763 Views
Message 10 of 10
Flag for a moderator

Re: Emails Bouncing

As stated in in the above responses, Mimecast will only talk to their customer’s designated Mimecast administrator. So, find out who that is in your company, explain that VM’s NTLworld domain is being blocked and request that the admin asks Mimecast to remove it from their blocklist.

And as I said above, if time is of the essence, the fastest solution may be to open a Gmail account and use that for emails you send to your work addresses.

0 Kudos
Reply