Gmail email rejected

Stephane Pras stpras at
Wed Nov 2 09:43:38 UTC 2022



I already had this problem just by sending several e-mails with attachments through Microsoft Outlook. They were rejected by all g-mail addresses, all other ones went fine. After a while, the problem was gone, and I could resend the same e-mails to g-mail addresses successfully.


I strongly suspected g-mail firewall to be too selective, or acting in an inappropriate manner. Probably not an Omnis problem.


Best regards,




From: omnisdev-en <omnisdev-en-bounces at> on behalf of <kim at>
Reply to: OmnisDev List - English <omnisdev-en at>
Date: Wednesday 2 November 2022 at 09:53
To: OmnisDev List - English <omnisdev-en at>
Subject: Gmail email rejected




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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