E-mail parou de receber mensagens

Os e-mail pararam de funcionar. Estão retornando ao remetente com o erro:
returned ‘550 5.4.300 Message expired’

Can you explain further and include your URL?

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Delivery has failed to these recipients or groups:

polatti@otimo.ind.br (polatti@otimo.ind.br)
Your message couldn’t be delivered. Despite repeated attempts to contact the recipient’s email system it didn’t respond.

Contact the recipient by some other means (by phone, for example) and ask them to tell their email admin that it appears that their email system isn’t accepting connection requests from your email system. Give them the error details shown below. It’s likely that the recipient’s email admin is the only one who can fix this problem.

Diagnostic information for administrators:

Generating server: BN3NAM04HT062.mail.protection.outlook.com
Receiving server: BN3NAM04HT062.eop-NAM04.prod.protection.outlook.com
Total retry attempts: 26

10/27/2019 1:32:39 AM - Server at BN3NAM04HT062.eop-NAM04.prod.protection.outlook.com returned ‘550 5.4.300 Message expired’

Sounds like you need to use ImprovMX.com instead of our free forwarders.

And you still didn’t include your free 000webhostapp URL.

The email is working. Thank you very much.

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