Gmail email rejected

kim at kim at
Wed Nov 2 08:53:10 UTC 2022


I have client that that has started sending the pdf files as an attachment
to an email by smtp directly from the program.

They have all gone through except for gmail address.  Eg name at
<mailto:name at>  

The following message was:

This Message was undeliverable due to the following reason:

Your message was not delivered because the destination computer refused
to accept it (the error message is reproduced below). This type of error
is usually due to a mis-configured account or mail delivery system on the
destination computer; however, it could be caused by your message since
some mail systems refuse messages with invalid header information, or if
they are too large.

Your message was rejected by for the following

5.7.1 [] Messages missing a valid messageId header are not
5.7.1 accepted. b12-20020a170903228c00b00186ff4b98a1si15640246plh.208 -

The following recipients did not receive this message:

name at <mailto:name at> 


Internet provider is Telstra :    works for all
other emails

The business just recently changed their email address to a business email
with a new company.  I was wondering whether this may be a problem and they
may require some other authorisation. 


What settings do you require to allow emails to go by smtp too gmail


Any ideas would be greatly appreciated



Kim Martel

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