Your site has [NumberOfIssues] technical SEO issues
[FirstName],
Ran [CompanyWebsite] through our crawler—found [NumberOfIssues] issues killing your rankings:
[SpecificIssue1]
[SpecificIssue2]
[SpecificIssue3]
The [MostSevereIssue] is the worst—Google's probably docked you [EstimatedRankingLoss] positions on competitive terms.
[ClientExample] had [SimilarIssue]. Took us 3 days to fix. They jumped from position 12 to position 4 for "[TheirKeyword]" within 2 weeks.
I can send the full technical audit (32 pages) or just the 5 critical fixes. Which is more useful?