CMS Email Format

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The most common CMS email format is [first].[last] (ex. jane.doe@illinois.gov), which is being used by 97.6% of CMS work email addresses.

Other common CMS email patterns are [first_initial][last] (ex. jdoe@illinois.gov) and [last] (ex. doe@illinois.gov). In all, CMS uses 11 work email formats.

CMS Email Formats and Examples

Email Format	Example	Percentage
[first].[last]	jane.doe@illinois.gov	97.6%
[first_initial][last]	jdoe@illinois.gov	0.9%
[last]	doe@illinois.gov	0.3%
[first][last]	janedoe@illinois.gov	0.3%
[first][last_initial]	janed@illinois.gov	0.3%
[first]	jane@illinois.gov	0.3%
[last][first_initial]	doej@illinois.gov	0.1%
[first]_[last]	jane_doe@illinois.gov	0.1%
[first].[middle_initial].[last]	jane.m.doe@illinois.gov	0.1%