The most common QS/1 email format is {f}{last}@qs1.com (e.g. jdoe@qs1.com), used in about 62% of observed QS/1 work emails. QS/1 uses 2 address formats in total.
Most likely format — based on 421 observed addresses
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QS/1 email formats
61.5% of observed QS/1 addresses use the {f}{last}@ format.
Email formatExampleShare
{f}{last}@qs1.com
Examplejdoe@qs1.com
Share61.5%
{first}_{last}@qs1.com
Examplejane_doe@qs1.com
Share38.5%
Derived from 421 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 QS/1, that means testing {f}{last}@qs1.com 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 QS/1 email format is {f}{last}@qs1.com (for example jdoe@qs1.com), used in about 62% of observed QS/1 work addresses. QS/1 also uses 1 other format for name collisions.
How accurate is this QS/1 email format?
This format is derived from 421 real QS/1 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 QS/1 email?
Apply the most common pattern to the person's name (e.g. jdoe@qs1.com), 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 QS/1 use?
Beyond {f}{last}@qs1.com, observed formats include {first}_{last}@qs1.com, in descending order of frequency.
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