It will look even more suspicious if you do this from a fresh or even virgin IP address. The red flag is raised as soon as you try to deliver a suddenly increased flow of emails. Typical reasons for throttled emailsĮmail services will throttle your email campaign for only one reason – if you exceed the acceptable limit of email sending during a specified period. However, some ESPs do not separate these notions and use the term throttling to define the rejection by sending or receiving server. When an email has been relayed from the sending server to the receiving one, it can not be throttled any more. So, the sending server will try to send the email later. The delivery attempt has occurred, but the email has not been accepted by the recipient server. The delivery attempt has not been carried out and the mail client needs to retry it.Ī deferred email is an email rejected by the receiving server. What is the difference between a throttled and deferred email?Ī throttled email is an email rejected by the sending server.
But there are also other reasons that we’re going to explore a bit later. So, throttling can be carried out explicitly by you or by the sending server, if your delivery volume exceeded the established rate. For users of email services: email throttling means intentional limiting the amount of email messages sent through an ESP’s server at one time.For email services: email throttling is slowing-down or blockage of mail sending due to an exceeded email delivery rate.This term may have two definitions depending on the side it’s implemented on:
#Definition of throttled how to#
This is called email throttling, and in this article, you’ll learn how to use this for your own benefit.
#Definition of throttled code#
The mail client won’t be able to connect to the server and will get a 5xx or 4xx error code claiming that the user’s mailbox is over quota or something like that. If a sender exceeds the acceptable threshold, the emails will be bounced back. This is a measure to protect against spammers that tend to send big amounts of emails at once. Email service providers (ESPs) set up limits on the email volume you can send.
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