To reduce spam, carriers like Verizon, AT&T, T-Mobile, etc can put temporary blocks on your landline if their algorithms detect spam like activity. This block disables your ability to send or receive messages to your landline but does not affect your phone service. These blocks tend to last around 24 hours. To prevent your number from being temporarily blocked, below are things you SHOULD AVOID DOING:
- Outbound Throughput - Sending messages at a rate that exceeds recommended throughput can trigger a block. (Toll-free 30mps/number, Standard 1mps/number). Slow down the rate at which you send multiple messages.
- Frequency – Pumping out traffic at consistent throughputs such as 1mps for periods of time. This traffic would be at a high risk of spam blocking. Avoid consistent, timed-intervals of sending messages.
- Volume - Sending messages to more than 200 unique mobile numbers a day from standard number will increase risk of spam blocking.
- Weighted Traffic - On standard numbers, sending a higher ratio of outbound to inbound messages is subject to spam filtering. 3:1 outbound to inbound ratio or less is ideal for standard numbers. Greater may be at some risk of blocking, and > than 50:1 is high risk of blocking.
- Content Variance - Identical message content sends are problematic, change it up, personalize it.
- URLs in messages - Avoid the inclusion of 3rd party link shortners when sending with 10-digit numbers such as Bitly, TinyURL, goo.gl. Use common/popular U.S. domains somewhere in the URL. For example links with .com, .net, .org, somewhere in the link has typically been lower risk of getting filtered than uncommon top level domains.
If you have any questions, feel free to reach out to email@example.com.