The most common CSTB email format is {first}.{last}@cstb.fr (e.g. jane.doe@cstb.fr), used in about 98% of observed CSTB work emails. CSTB uses 4 address formats in total.
Most likely format — based on 426 observed addresses
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CSTB email formats
98.4% of observed CSTB addresses use the {first}.{last}@ format.
Email formatExampleShare
{first}.{last}@cstb.fr
Examplejane.doe@cstb.fr
Share98.4%
{last}@cstb.fr
Exampledoe@cstb.fr
Share0.9%
{last}.{first}@cstb.fr
Exampledoe.jane@cstb.fr
Share0.5%
{f}.{last}@cstb.fr
Examplej.doe@cstb.fr
Share0.2%
Derived from 426 real observed addresses · data refreshed 2026-05-30. Role-based inboxes (info@, sales@, …) are excluded from format detection.
Verify the pattern before you send
Start with the format that appears most often. For CSTB, that means testing {first}.{last}@cstb.fr first, then verifying the exact address before it reaches your CRM or sequencer. A pattern can be common and still produce bad guesses when a person uses a nickname, a middle initial, a regional mailbox, or an older alias.
VeriMails checks syntax, MX records, SMTP behavior, disposable domains, and catch-all detection so you can keep valid addresses and skip risky ones. For larger files, credits start at $19 for 10,000 verifications and never expire. Create a free account, test the pattern on a few addresses, then buy more credits only when you need volume. Run the check again before a large campaign if the list is old, because domains change mail routing and people leave.
The most common CSTB email format is {first}.{last}@cstb.fr (for example jane.doe@cstb.fr), used in about 98% of observed CSTB work addresses. CSTB also uses 3 other formats for name collisions.
How accurate is this CSTB email format?
This format is derived from 426 real CSTB addresses observed across our data, not guessed. To confirm a specific address, use the live verifier above — it checks deliverability in real time.
How do I find and verify a specific person's CSTB email?
Apply the most common pattern to the person's name (e.g. jane.doe@cstb.fr), then verify it on this page — or use the Find tab to get the likely address from their name automatically.
What other email formats does CSTB use?
Beyond {first}.{last}@cstb.fr, observed formats include {last}@cstb.fr, {last}.{first}@cstb.fr, {f}.{last}@cstb.fr, in descending order of frequency.
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