Carrier filtering recruiting text messages: why texts get blocked and what to change

Carrier filtering of recruiting text messages happens when wireless carriers and their partners flag your texts as unwanted and quietly block them. If you keep asking why your recruiting texts are not delivered, start here. The usual causes are missing consent, a missing opt-out, unclear sender identity or bulk sending patterns. The fix is to change how you collect consent, write messages and pace sends.

What carrier filtering is

Carriers protect their subscribers from unwanted messages. Industry guidelines treat texts sent by a business to many people as business messaging, and that includes an employer texting candidates. That kind of traffic gets more scrutiny, and filtering is one of the tools carriers use. Filters look at what you send and how you send it, including volume and whether people reply.

What the symptom looks like

• Candidates say they never got a text you can see was sent.
• Reply rates drop suddenly on a campaign that used to work.
• Some candidates get your messages and others on a different carrier do not.
• Interview reminders go out, but no-shows rise and nobody confirms.

Likely causes

• Texting numbers that never opted in, such as imported, purchased or shared lists.
• First messages that do not say who you are or why you are texting.
• No clear way to opt out, or opt-outs that are not honored.
• The same wording sent to a large list at once, with few replies coming back.
• Messages that look like spam or phishing: vague offers, pressure to click, requests for personal details.
• Old or recycled numbers that no longer belong to the candidate.

How to fix it

1. 1 Confirm consent for every number Only text candidates who agreed to receive texts. Build your own opt-in list from applications and do not import rented, sold or shared lists. ATS Mako captures prior consent so you have a record to point to.
2. 2 Say who you are in the first message Name the recruiter, the company and the role. A candidate who recognizes the sender is less likely to report the message as spam.
3. 3 Include opt-out language and honor it Tell candidates which word stops messages. ATS Mako supports Reply STOP opt-out and handles opt-outs automatically, so a candidate who opts out is not texted again.
4. 4 Write for a conversation, not a blast Ask a question the candidate can answer. Two-way conversations look like wanted messaging. In ATS Mako, automations step aside when a candidate replies, and the reply lands in one inbox so a recruiter can pick it up.
5. 5 Narrow the audience Send to the candidates a message actually applies to, not your whole database. Use audience segmentation to target by role, location or stage.
6. 6 Pace and time your sends Avoid sudden spikes in volume. ATS Mako respects quiet hours, so automated texts do not go out at odd times. Trigger messages off real events, like a status change or a scheduled interview, using automated engagement workflows.
7. 7 Clean your list Remove numbers that have opted out, that bounce or that a candidate says are wrong. Texting a number that no longer belongs to the candidate is a common source of complaints.

Hi [First name], this is [Recruiter name] at [Company] about your application for [Role] in [Location]. Are you still interested? Reply YES to continue or STOP to opt out.

How to confirm it worked

• Watch replies in the centralized inbox. Wanted messages get responses, so returning replies are the clearest signal.
• Ask a few candidates on different carriers to confirm they received a message.
• Send a test to team members on different carriers before a large send.
• Check that interview confirmations and reminders get acknowledged again.

ATS Mako supports multi-provider SMS, sending and receiving across more than one SMS provider for deliverability and flexibility at scale. It does not replace good practice. Consent, clear identity and opt-out handling still matter on every route.

When to contact support

Contact support if delivery stays low after you have worked through the steps above. Include the affected numbers, example message text, the dates of the drop and any candidate reports of missing texts. Industry guidelines anticipate that senders may need to show evidence that their messages were blocked, so keep that detail organized. For broader guidance, see these SMS recruiting best practices.