Carrier Filtering Overview
If too many text messages are sent to mobile numbers hosted by the same carrier (e.g., Verizon, AT&T, etc.), the recipient's carrier may begin to reject text messages from the sender's number due to spam filtering. Individual messages may be flagged as "carrier violations" as well, depending on the content of the text message. This is actually an intentional feature, implemented by the carriers, to prevent mobile numbers from unwanted spamming.
How do I know if my messages are being filtered?
Why do carriers have content and spam filters?
How do carriers filter messages?
Links (Updated 07/08/2020)
Based on new information and from observing carrier behavior, including a link in a message is now at a high risk of that message being filtered and/or not delivered. This applies even to single messages not sent as part of a batch (including Smart Messages). Shortened links, using services such as bit.ly and goo.gl are filtered at a higher rate than messages containing standard, full links - but both will put the delivery of your message at risk. We have also noticed that including emails in a text message have begun to be flagged (emails are being considered links). For this reason, links should be avoided. This also includes email addresses, which also should not be sent in text messages, as most carriers read them as links.
In some cases, messages that include a link are not delivered at all to the recipient and do not display a carrier violation code/not delivered message due to carriers not reporting the message was filtered.
How do I prevent my messages from being filtered?
- Avoid sending mass texts from the same phone number to multiple lists of contacts in a short time period.
- As the amount of unique contacts that are being texted per day by a single number increases, so does the risk of carrier filtering.
- Avoid sending links if possible - shortened links specifically, because they hide the actual destination, and full links put a message at a much higher risk of filtering by certain carriers
- Utilize the "Send as assigned user" function (Admins only). This function will send text messages from each users texting number (rather than one single texting number), therefore reducing the amount of messages that are sending per phone number in Cadence.
- Avoid confusing messages. Suspicious recipients are more likely to report messages to their carrier, and when messages are reported to carriers, it becomes more likely that future messages from that number or with similar content will be filtered.
- Avoid overly long messages, messages IN ALL CAPS, short links, hyperbole, and the use of aggressive language, as these may raise the level of suspicion of your recipients.
Cadence and Long Codes
I think my number has been blacklisted by a carrier. Can I get it removed?
Can I get my messages whitelisted by the carriers?
How do I know I am sending to Actual Mobile Numbers?