There are two extreme opinions I see among marketing agencies and email senders when it comes to volume.
One group seems to think that volume alone triggers blocks. Another group thinks volume never affects delivery.
As with many things in delivery reality is at neither extreme.
Sending lots of mail isn’t the problem. Sending lots of mail your recipients aren’t interested in getting is the problem. Last year during the US political elections the Obama campaign, for instance, sent lots and lots of mails. Their list was an order of magnitude larger than the Romney campaign and there were days they were sending 10s of mails per subscriber. It was a deluge. But they were smart, and they did a lot of data mining and they did it in a way that got recipients to act on the mail. That mail was a deluge, but it was a wanted deluge by most of the receivers.
For a lot of vendors, too, increasing volume does increase response and revenue and all the things you want to drive with email marketing. But there will be people who don’t like the increase in volume. If they’re not valuable customers, no great loss. If they are valuable customers, then the increase in volume may drive a decrease in revenue.
In terms of inbox delivery, it’s not the volume it’s how wanted the mail is. Send wanted, interesting and engaging mail, you can send dozens of times a day.
No, volume alone doesn’t contribute to delivery problems.