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                            • Good to Know

                              Email Throttling

                              Email throttling is the practice of controlling the number of emails sent at a time to one ISP (Internet Service Provider) or remote server. When a single sender launches a high volume of emails at one time, ISPs may block these emails to prevent potential spamming.

                              Some ISPs limit the number of emails they accept from a particular sender during a specified period of time. If the sender exceeds an acceptable threshold, the ISP will reject any additional emails, resulting in a high number of bouncebacks. In most situations, this rejection of additional emails is usually temporary.

                              SoGoSurvey aims to deliver your emails as quickly as possible. Still, all major ISPs postpone delivery as a means of preventing spam. There is no reliable source that identifies the limits used by each ISP. These thresholds can also be changed quickly if any suspicious behavior is detected. Consecutive high bounce rates, received emails being marked as spam, and other similar behavior can cause an ISP to start blocking emails sent from that IP address.

                              SoGoSurvey’s email throttling of delivery to public domains is subject to change based on the number of emails sent.