I need to white list outr email server IP

Ante Kotarac 20 Reputation points

I'm working on project where we have our own email server, it is connected in rerouting schema with exchange online using outbound/inbound connectors.
When client sends email to over 380 recipients, we are getting error "too many recipients".

Settings in exchange 'Recipients limit' is set to 500, but only 380 are processed.

Our clients are complaining, we need help with this.

Any suggestions here would be much appreciated.

Thank you in advance.

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Ante Kotarac 20 Reputation points

    Hi, sorry for late response, had a busy week.

    We have customers to whom we provide email update service, they use exchange online.

    We connect to their online exchange our mail server that does processing (Mail Flow - Connectors - Outbound/Inbound).

    So, based on configuration some emails are re-routed to/from our email server.

    This fails when there are more then 380 recipients.

    Thank you in advance for any help, Ante