[Users] Sending to some who has a gmail account.

[PierGianLuca Porta Mana]

Are you trying to send the email from your domain, hosted somewhere? Then maybe you must make sure that your DNS records do not present anomalies. For example, if you use cPanel to manage your domains and emails, check the "Email Deliverability" panel. There you can make a check of the DNS records for your email addresses and also repair them.

Not sure if this is the problem though, apologies if I'm missing the point.

On 2022-03-11 22:18, Abrolag wrote:
> On Fri, 11 Mar 2022 21:03:24 +0000
> Brian Morrison <bdm at fenrir.org.uk> wrote:
> 
>> On Fri, 11 Mar 2022 21:00:08 +0000
>> Abrolag <abrolag at users.sourceforge.net> wrote:
>>
>>> On Fri, 11 Mar 2022 20:35:40 +0000
>>> Brian Morrison <bdm at fenrir.org.uk> wrote:
>>>
>>>> On Fri, 11 Mar 2022 20:07:59 +0000
>>>> Abrolag <abrolag at users.sourceforge.net> wrote:
>>>>   
>>>>> I've just been hit by this for the first time, and frankly have no idea what
>>>>> I'm supposed to do.
>>>>
>>>> Hit by what?
>>>>   
>>> Message rejected by google
>>>
>>
>> Without you telling us what the rejection message says it's difficult
>> to know why this is happening. There is a lot going on during an MTA
>> transaction.
>>
> host gmail-smtp-in.l.google.com [108.177.15.27]
>      SMTP error from remote mail server after end of data:
>      550-5.7.26 This message does not have authentication information or fails to
>      550-5.7.26 pass authentication checks. To best protect our users from spam,
> the 550-5.7.26 message has been blocked. Please visit
>      550-5.7.26  https://support.google.com/mail/answer/81126#authentication for
> more 550 5.7.26 information.
> u14-20020adfed4e000000b001ef5ac5e851si5283155wro.647 - gsmtp
>