Bulk Email Bandwidth Comparison Chart

It's easy to underestimate the amount of bandwidth needed to send a large batch of email. Use our handy Email Marketing Bandwidth Requirements Chart to find out how much bandwidth you really need.

This chart is based on 10K emails. Naturally, your bandwidth requirements will go up if you're sending larger emails, and if you're sending attachments, your bandwidth needs will rapidly multiply.

Available Bandwidth Average emails/hour Data Rate (bits per second) 28.8K Modem: 1,300 28.8 Kbps 56K Modem: 2,500 56 Kbps ISDN: 5,800 128 Kbps T1: 72,000 1.544 Mbps Cable Modem: 23,000-140,000 512 Kbps to 3 Mbps - typically DSL: 23,000-370,000 512 Kbps to 8 Mbps T3: 2,000,000 44.736 Mbps OC-256: 620,000,000 13.271 Gbps

* Assumes email message is 10k in size