diff --git a/smtp/date.ts b/smtp/date.ts
index 041a9a7..87a4224 100644
--- a/smtp/date.ts
+++ b/smtp/date.ts
@@ -40,7 +40,7 @@ export function getRFC2822DateUTC(date = new Date()) {
  * @see https://github.com/moment/moment/blob/a831fc7e2694281ce31e4f090bbcf90a690f0277/src/lib/create/from-string.js#L101
  */
 const rfc2822re =
-	/^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/.compile();
+	/^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/;
 
 /**
  * @param {string} [date] a string to check for conformance to the [rfc2822](https://tools.ietf.org/html/rfc2822#section-3.3) standard