SMS Deliverability in Salesforce: Why Messages Fail and How to Fix It

Carrier Filtering

Mobile carriers may temporarily filter some messages when they identify suspicious, non-compliant, and spam-like patterns in messaging, including:

This negatively impacts engagement rates, affects legitimate business messages, and causes carriers to restrict delivery.

Messages that rely on urgency, excessive promotion, or unclear intent are flagged more often. This includes repeated templates with minimal variation, and these factors reinforce each other.

Poor Contact Data Quality

Not just the well-crafted but even the most compliant campaign can also flop if businesses are reaching for improperly maintained contact records, like:

These failed deliveries waste messaging resources and affect sender reputation over time.

Missing Customer Consent

Obtaining customer permission is a critical requirement for effective SMS communication. However, many businesses fail to do so. This can cause carrier filtering to flag the traffic as potentially spammy and unwanted.

Also, it leads to compliance violations, message blocking, and reduced sender trust. Over time, repeated unverified messaging activity can negatively affect future campaigns and damage the sender’s reputation.

Consent is often assumed rather than recorded, and that’s why opt-out instructions are sometimes omitted. Carriers don’t treat these as minor gaps. Messages are filtered early when compliance signals are weak.

Unstable Sender Reputation

SMS sender reputation scores are built gradually and lost quickly. Sudden increases in volume, irregular sending patterns, or messaging to outdated contact lists affect how carriers classify traffic.

Incomplete 10DLC Implementation

10DLC deliverability rules are not optional in regulated markets. Partial registration or mismatched campaign details create immediate restrictions, leading to a drop in throughput and an increase in filtering.

Consent Management

Companies must receive explicit opt-in approval from customers prior to sending any transactional or promotional text messages and must retain verification of customer authorization, including how and when permission was granted. These historical accounts help both in demonstrating legitimacy to carriers and supporting compliance efforts.

Opt-Out Management

Companies must also provide customers with an easy withdrawal method using common industry standard keywords (e.g., UNSUBSCRIBE, CANCEL or STOP) and should process any requests to opt-out posthaste. By providing customers with the ability to opt out of text messaging, the companies will help ensure compliance and thereby only communicate with customers who wish to receive these messages. Doing so will further help increase deliverability and enhance customer experience.

Data Privacy Compliance

Based on where an organization operates, SMS programs must also align with applicable industry guidelines and data privacy regulations, this may include:

While focusing on data collection, personal information handling, and communication preferences, these frameworks ensure the protection of customer data while reducing compliance and legal risks.

Audit Trails

Managing detailed audit records is another essential aspect when it comes to improving SMS deliverability in 2026. That means, organizations should keep records showing:

Maintain a Clean Contact Database

Ensuring strong SMS deliverability begins with accurate customer information. That means, organizations should regularly review and remove opted-out contacts, duplicate records, invalid phone numbers, and inactive subscribers to ensure that messages are directed towards active and reachable recipients.

Automate Consent and Preference Management

By automating consent management, Salesforce users can easily maintain compliance records and track customer opt-ins records. Moreover, they can enable customers to learn how and when they receive communication. Ultimately, this ensures that organizations will remain compliant while still providing their customers with the opportunity to receive only the messages they have opted in to receive.

Use Workflow Automation

Timing is important for SMS to perform effectively. So, no matter if you are sending order updates, service notifications, or appointment reminders, automated workflows ensure that the messages are delivered at the right time based on business events, predefined workflows, and customer actions.

Monitor Messaging Frequency

Overly frequent messaging may cause irritation to customers, thus making SMS engagement less effective for businesses. This can also result in spam reports, customer dissatisfaction, and increased filtering by carriers. Therefore, all organizations should establish a set of messaging frequency guidelines for their customers to respect their preferred mode of communication.

Optimize Sender Reputation

Sender reputation is cumulative, and each campaign contributes to how future messages are treated. Reputation does not improve through volume. It improves through consistency, and a strong SMS sender reputation reduces friction at the carrier level and supports high SMS deliverability in Salesforce. So, do these:

1. Send messages to verified users, with opt-in on.
2. Keep volume increments gradual and not sudden.
3. Maintain predictable sending intervals
4. Remove inactive contacts without delay

Follow 10DLC Deliverability Rules

10DLC frameworks exist to give carriers visibility into business messaging. Without proper registration, traffic is treated as unverified, though gaps in 10DLC deliverability rules don’t always result in immediate blocking. However, more often, they result in gradual throttling and increased filtering, which is harder to detect. Avoid these by:

1. Register brand and campaign details accurately
2. Align actual message content with declared use cases
3. Avoid using one campaign for multiple unrelated purposes
4. Monitor registration status and updates regularly

Using verified mobile phone numbers as part of a company's text messaging initiative increases the likelihood of engagement because most consumers will more readily respond to messages from known senders. A verified sender provides easily identifiable proof that communications from a given source are indeed legitimate and builds customer trust through familiarity, enhances visibility of brand recognition, and further increases SMS deliverability.

Craft Compliant and Relevant SMS Content

Your message content must be clear and aligned with user expectations. Repetition without variation is a common issue, and identical messages sent repeatedly increase the likelihood of filtering. Therefore, content should remain consistent in intent, not identical in structure. Follow these steps:

1. State the purpose of the message directly
2. Avoid exaggerated claims or forced urgency
3. Include opt-out language where required
4. Keep formatting simple and readable

Avoid Carrier Filtering in SMS

Avoiding SMS carrier filtering issues requires operational discipline more than technical changes. Filtering isn’t always immediate and often increases gradually as patterns are observed. So, early corrections prevent larger disruptions:

1. Don’t send multiple messages within short intervals unless expected by the user
2. Avoid re-sending failed messages without identifying the cause
3. Use registered sender identities consistently
4. Ensure message timing aligns with user activity patterns

Improve SMS Routing Practices

Routing decisions affect both speed and reliability of deliveries, and using indirect or unreliable routes poses a risk that can be avoided. Additionally, at times, the best practices of SMS routing are not considered seriously since they operate in the background. So, to follow the best measures, do these:

1. Use providers with direct carrier connections where possible
2. Evaluate route performance by region, not globally
3. Monitor latency alongside delivery rates
4. Maintain fallback routing for critical communication