If you get an error "connection rate limit exceeded" when sending the e-mails, you can find out here how to be able to remedy/avoid it.
This error occurs if e-mails are retrieved too often from the server or if a check is made to see whether new e-mails are present. (Each retrieval, whether new e-mails are available, is a connection to the server).
If this limit is reached, the mentioned error appears and temporarily no more e-mails can be sent. The following steps explain how to change the polling interval in Thunderbird.
The mentioned error messages are as follows for Mozilla Thunderbird:
Select in the upper navigation bar of Thunderbird the point "Extras" and click on "Account Settings".
Then select the "Server settings" on the left side for the corresponding e-mail inbox.
Then set the value under "Check all ... Check minutes for new messages" to 10 minutes. This value is normally sufficient, since in very few cases new e-mails are received every minute.
Confirm your entry with a click on the "Ok" button.
After a maximum waiting time of 24 hours, the sending works again without any problems. and will also not occur in the future, if the limitation is not caused by excessive e-mail dispatch (e.g. newsletter). or manual retrieval of e-mails is exceeded.
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