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These rates can change without notice, so JEMHC does not ‘try’ to stay within them. If JEMHC sends mail volumes that hit this limit, the mail-server can block the mail sending account. JEMHC reacts to send-failures by backing of in ever increasing amounts. After an hour, JEMHC takes the handler offline which re-enabled manually.
Options
Future implementation of https://thepluginpeople.atlassian.net/browse/JEMHC-2415 could allow the load to be spread over a set of accounts.
Use of SMTP relay features of some
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mail servers (Gmail: https://support.google.com/a/answer/2956491#sendinglimitsforrelay ) has a combination of limits (see link for full details)
The maximum number of messages a user can send in a 24-hour period is 10,000. However, this can vary, depending on the number of user licenses in your Google Workspace account.
A registered Google Workspace user can't relay messages to more than 10,000 unique recipients in a 24-hour period.
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The maximum number of total recipients allowed per customer per 24-hour period is approximately 130 times the number of user licenses in your Google Workspace account, with an upper bound of 4,600,000 recipients per 24-hour period for large customers. If a customer exceeds this limit, users see the error "550 5.7.1 Daily SMTP relay limit exceeded for customer."