Cross-client compatibility means a signature rendering the same way across different email clients — Gmail, Outlook, Apple Mail, Yahoo Mail, mobile apps and webmail. It is achieved by using restricted, widely supported HTML such as table-based layouts, inline CSS and standard web-safe fonts.
Modern CSS features (flexbox, grid, web fonts, background images) are inconsistently supported in email and are the usual cause of signatures breaking.
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Cross-client compatibility means a signature rendering the same way across different email clients — Gmail, Outlook, Apple Mail, Yahoo Mail, mobile apps and webmail. It is achieved by using restricted, widely supported HTML such as table-based layouts, inline CSS and standard web-safe fonts.
Modern CSS features (flexbox, grid, web fonts, background images) are inconsistently supported in email and are the usual cause of signatures breaking.
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