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Message 11 of 20
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Re: email send error VM520 Recipient domain invalid

If you try sending to an individual address, does it go through?




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Message 12 of 20
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Re: email send error VM520 Recipient domain invalid

@one-eye 

Can you try sending to an individual address and see what happens.

The problem with the list of failures you've given, is that with so many of them being major email companies, you have to ask yourself, why are YOU the only one seeing them.

There are a number of different reasons why you might get recipient domain invalid.

1.  DNS lookups for an MX or an A record return NXDOMAIN - record not found.
2. Domain indicates it does not receive mail by publishing a null MX record i.e. 0 "."

There may be some other reasons as well.  Usually each failure would produce a different VM error code.

However we know that:

1.  These are valid domains
2.  At least one user (me) can send to at least two of those domains.

Tim

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Message 13 of 20
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Re: email send error VM520 Recipient domain invalid

Yes I can send successfully individually but, with about 150 contacts, it’s a pain to have to do that with the same message.

In addition (don know if it’s related or not), I notice that I’m getting an intermittent “! within a triangle” symbol appearing against my Virginmedia inbox, with an accompanying message “unable to read imap.virginmedia.com”. This goes away but keeps coming back intermittently, and is only a problem with the virginmedia account.
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Message 14 of 20
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Re: email send error VM520 Recipient domain invalid

You appear to be trying to send an email to 150 recipients via a single email client transaction.

You should be aware that VM has placed an upper limit of 100 on the number of recipients allowed in such a single email client “send”.

See this - https://www.virginmedia.com/help/virgin-media-mail-email-sending-limits

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Message 15 of 20
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Re: email send error VM520 Recipient domain invalid

Thanks for that info. Actually I seem to be able to send to up to 10 or 12, but then it stops working 

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Message 16 of 20
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Re: email send error VM520 Recipient domain invalid

As a temporary workaround, using VM Webmail should allow you to send up to 500 emails before your account is temporarily disabled. That should be enough to inform all your contacts of your new email address.

That's providing you have do have access to your address book in Webmail of course.

 

 




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Message 17 of 20
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Re: email send error VM520 Recipient domain invalid


@Sololobo wrote:


That's providing you have do have access to your address book in Webmail of course.


Create the email in Mail addressed to all recipients, save as Draft, synchronise, sign into webmail, edit draft message and send.

 

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Message 18 of 20
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Re: email send error VM520 Recipient domain invalid

Thanks!
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Message 19 of 20
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Re: email send error VM520 Recipient domain invalid

Ok here's my thoughts.

Consider how a single message to multiple email addresses works.

Email transaction works like this, I'm going to deal with the client side only at first and I'm going to ignore authentication.

1. Client sends HELO/EHLO
2. Client sends MAIL FROM: <sender address>
3. Client sends RCPT TO: <recipient address>
4. repeat 3 until no more recipients
5. Client sends email

At each stage the server responds either with 2xx indicating success OR with an error code (4xx - temporary error or 5xx - permanent error)

If we get an error code from ANY of the RCPT TO: commands - then the whole email send is aborted BEFORE the email is actually sent

So - it only takes 1 of the 150 contacts in your contact list to cause this problem.

Tim

Edit - When was the last time you cleaned your contact list?  A number of domains have closed, and as such may have been added to a list of domains that should not be sent emails to under any circumstances.

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Message 20 of 20
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Re: email send error VM520 Recipient domain invalid

@one-eye 

It might be worth taking a look at Connection Doctor on the MAC

https://support.apple.com/en-gb/guide/mail/mlhlp1189/mac

Specifically you want to look at the connection activity for the SMTP service as this should tell you exactly which RCPT TO: address caused the error.

Tim

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