Please use the SMTP relay at your 550-5.7.1 service provider instead.

[CamposMansi]

 Hi,
I've been receiving the following error for a few weeks:

Please use the SMTP relay at your 550-5.7.1 service provider instead.

What I can do? I'm desperate

[cinique]

I'm desperate

No you're not, otherwise you won't post on a forum, looking for a quick answer, rather than an internet search.
https://www.howtoforge.com/community/threads/please-use-the-smtp-relay-at-your-550-5-7-1-service-provider-instead-learn-more.47595/

Shared hosting is cheap these days. Just saying.

[CamposMansi]

To give me a cheap accommodation, I would not have a cwp ... If you are looking for my presentation, you will know why I use cwp

I'm sorry to tell you that you have not solved anything at all for me, with what you tell me I already know, everything is well configured at the DNS level, the problem is being the cwp.

I know I have a dynamic IP and it is removed from the blacklists, but ...

Because a week or two ago it worked so well and now it has stopped working?

[cinique]

If any of your applications run sendmail, then switch to SMTP.

[FreshLondon]

Please use the SMTP relay at your 550-5.7.1 service provider instead.

Lets assume what you really mean is this:

Code Select Expand

550-5.7.1 [12.34.56.78] The IP you're using to send mail is not authorized to
550-5.7.1 send email directly to our servers. Please use the SMTP relay at your
550-5.7.1 service provider instead.
Connection closed by foreign host.

I assume that either you haven't set up:

• DKIM / SPF records correctly
• rDNS PTR records
• or you're blacklisted

You'll need to provide more information, whats the full error message?

There's a really good guide here:
https://hoststud.com/resources/resolved-error-550-5-7-1-this-message-does-not-have-authentication-information-or-fails-to-pass.476/

[CamposMansi]

Thanks for the answer now I look at the link, I copy the original message

Code Select Expand

This is the mail system at host cwp.server.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<pruebas@gmail.com>: host gmail-smtp-in.l.google.com[74.125.133.27] said:
    550-5.7.1 [x.x.x.x] The IP you're using to send mail is not
    authorized to 550-5.7.1 send email directly to our servers. Please use the
    SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550
    5.7.1  https://support.google.com/mail/?p=NotAuthorizedError
    i66si437239wma.188 - gsmtp (in reply to end of DATA command)