The most common E Source email format is {first}_{last}@esource.com (e.g. jane_doe@esource.com), used in about 87% of observed E Source work emails. E Source uses 3 address formats in total.
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E Source email formats
86.9% of observed E Source addresses use the {first}_{last}@ format.
Email formatExampleShare
{first}_{last}@esource.com✓ verified
Examplejane_doe@esource.com
Share86.9%
{f}{last}@esource.com
Examplejdoe@esource.com
Share12.5%
{first}@esource.com
Examplejane@esource.com
Share0.6%
Derived from 168 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 E Source, that means testing {first}_{last}@esource.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 E Source email format is {first}_{last}@esource.com (for example jane_doe@esource.com), used in about 87% of observed E Source work addresses. E Source also uses 2 other formats for name collisions.
How accurate is this E Source email format?
This format is derived from 168 real E Source 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 E Source email?
Apply the most common pattern to the person's name (e.g. jane_doe@esource.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 E Source use?
Beyond {first}_{last}@esource.com, observed formats include {f}{last}@esource.com, {first}@esource.com, in descending order of frequency.
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