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pls. be informed, that when you configure "limitations on outgoing email messages" server-wide at "HOME > Tools & Settings > Mail Server Settings" or within your depending subscription for a specific domain, you should definetly raise the limits, when you setup Fail2Ban, in order to avoid restrictions for outgoing eMails.
Pls. check your domain - specific limits at for example: "HOME > Subscriptions > YOUR-DOMAIN.COM > Mail > Outgoing Mail Control".
if you didn't setup any limitations, pls. consider to investigate your mail - logs for issues/errors/problems and provide the corresponding entries if you need help from people willing to help you with your investigations.