Please use the below formula in [Column validation] of the list column edit section. Please replace the [Email] with your column name. Formula: --------------------------------------------------------------------- =AND( ISERROR(FIND(" ", [Email],1)), IF(ISERROR(FIND("@", [Email],2)), FALSE, AND( ISERROR(FIND("@",[Email], FIND("@", [Email],2)+1)), IF(ISERROR(FIND(".", [Email], FIND("@", [Email],2)+2)), FALSE, FIND(".", [Email], FIND("@", [Email],2)+2) < LEN([Email]) ) ...
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