Does volume cause blocking?

There seems to be a never ending debate about volume and how it affects delivery and revenue. I regularly get questions asking if ISPs block senders just for volume.
The answer is no. Unless you’re actually sending enough mail to overwhelm the incoming infrastructure, something that’s difficult on today’s internet, you’re unlikely to be blocked due to simply sending a high volume of mail.
Sending mail recipients don’t want, or mail that looks like spam, that will get the mail blocked or filtered.

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Don't wait to address delivery problems

One of the worst ways to deal with blocking issues is to ignore them and hope your mail magically moves from the bulk folder back into the inbox. While this does happen as ISPs and filter companies update their filters, it’s not that common and it’s usually the result of a sender actually cleaning up their sending processes and improving the quality of the mail they send.
Do not ignore blocks. What I generally tell people is that it takes at least as long to repair a bad reputation as it took to get that bad reputation in the first place. If you wait months before actually addressing delivery problems, you’re not going to make a change and have the filters react in hours.
This doesn’t mean that every block is a business crisis. Blocks happen and they do go up and down based on thresholds and automatic monitoring scripts and content. But if a block happens consistently for 4 or 5 days in a row it is time to look at what you’re doing. Don’t just focus on the sidelines and little stuff, either. Look at your marketing program and the mail you’re sending.

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Is volume a problem?

Volume in an of itself is not a problem. Companies sending mail people want can send multiple emails a day to every user. The volume isn’t a problem because the mail is wanted.
Many senders are confused and think volume is a filtering criteria. It’s not. Send all you want; just send it to people who actually want the mail.
A lot of companies in their growth phase find they do have delivery problems as their volume ramps up. But the problem isn’t the volume, the problem is that mail programs don’t scale. Companies mailing lower volumes can get away with sloppier practices. One because the chances of hitting bad addresses increases with the number of addresses you have. But the other is that filters do take volume into account. It’s not that the volume directly causes the filters to trigger, but volume causes the filters to look harder at mail. If the reputation and metrics are good, the mail is fine and hits the inbox. If they are poor, then mail hits the bulk folder or is filtered.
Overall, volume isn’t a problem, but increasing volume can expose fundamental problems in a mail program that result in delivery issues.
 

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