How to Fix Twilio Error 30007 (Message Filtered by Carrier)

Twilio error 30007 ("Message filtered") is the frustrating one: your registration is complete, your campaign is approved, and a carrier (or Twilio policy enforcement) still blocked the message as suspected spam. Unlike error 30034, which is binary and fixable in the Console, 30007 is probabilistic: a filter scored your message and it lost. Fixing it means understanding what the filters score.

What triggers carrier filtering

Content signals

• Spam-correlated language: "FREE!!", prize/winner framing, urgency stacking ("ACT NOW"), excessive caps and exclamation points, currency-symbol density.
• Restricted-category terms: anything in SHAFT or high-risk verticals (loans, crypto promos, debt relief) scores heavily, including euphemisms and creative spellings, which read as evasion.
• Public URL shorteners: bit.ly/tinyurl links are so abused by spammers that their presence alone can sink a message. Use your own domain.
• Anonymous messages: no brand name in the text is a spam pattern in itself.

Behavioral signals

• Sudden volume spikes from a number with no history; filters trust warmed senders.
• High recipient-complaint or opt-out rates from prior sends. Reputation follows the number and campaign.
• Traffic diverging from the registered use case: declared reminders, actual promotions.
• Stale lists: high invalid-number and non-response rates look like scraped or purchased data.

The systematic fix

1. Reproduce narrowly. Find which messages fail (Console → Monitor → Logs → filter by 30007). Is it all traffic, one template, one carrier? One-carrier filtering points to that carrier’s content rules; all-carrier suggests Twilio policy or systemic content.
2. Strip the template to neutral. Send a plain-language version (brand name, one sentence, no link, no caps) to an affected carrier’s test number. If it passes, reintroduce elements one at a time until you find the trigger (it is usually the link or a hot phrase).
3. Replace the link. Move to a branded domain (ideally the domain you registered), keep one link per message, and skip link-only messages.
4. Rewrite hot phrases. "50% off this week" survives where "FREE!!! LIMITED TIME!!!" dies. Plain declarative sentences with your brand name lead the pack.
5. Check your list hygiene. Prune non-responders and long-dormant numbers; confirm consent for every segment you send to. Filtering often lifts when complaint rates drop.
6. Warm new numbers. Ramp new senders over days (hundreds → thousands) instead of blasting from message one.

When to escalate to Twilio

If you believe the filtering is a false positive (compliant content, consented list, reasonable volume), collect three or more Message SIDs with undelivered/30007 status and open a support ticket. Twilio can review the messages, tell you (within carrier confidentiality limits) what pattern is triggering, and escalate to carriers when a filter is genuinely misfiring. What support cannot do is whitelist non-compliant content, so the fixes above have to come first.

Prevention beats cure

Filters are reputation systems: numbers and campaigns with a history of clean, wanted, answered traffic get the benefit of the doubt; unknown or complained-about senders get none. The programs that never see 30007 are the ones sending expected messages to people who asked, which is the same thing every other layer of the compliance stack rewards.

Frequently asked questions

Does error 30007 mean my campaign is suspended?

No, 30007 is per-message filtering. But sustained filtering plus complaints can escalate to campaign-level action, so treat a rising 30007 rate as an early warning, not background noise.

Why do my messages deliver on AT&T but filter on T-Mobile?

Each carrier runs its own filtering models with different sensitivities. Single-carrier filtering usually means that carrier’s content thresholds are stricter for your pattern. The neutral-template test against that carrier isolates the trigger fastest.

Am I charged for filtered messages?

Messages blocked in transit after acceptance may still incur charges depending on where the block occurred (Twilio policy vs downstream carrier). Check the message resource in the Console; either way the real cost of 30007 is undelivered communication, so fix the trigger.