diff --git a/maillogger/parser.py b/maillogger/parser.py
index f423b12..1d3fa58 100644
--- a/maillogger/parser.py
+++ b/maillogger/parser.py
@@ -4,8 +4,8 @@
 from typing import Dict, Optional
 
 
-REGEX = r'(?P<month>[A-Z][a-z]{2}) (?P<day>[0-9]{,2}) ' \
-    + r'(?P<time>[0-9]{2}:[0-9]{2}:[0-9]{2}) mail postfix/[a-z]+\[[0-9]+\]: ' \
+REGEX = r'(?P<month>[A-Z][a-z]{2}) +(?P<day>[0-9]{,2}) ' \
+    + r'(?P<time>[0-9]{2}:[0-9]{2}:[0-9]{2}) (?P<hostname>[A-Za-z0-9-]+) postfix/[a-z/]+\[[0-9]+\]: ' \
     + r'(?P<mail_id>[A-Z0-9]+): to=<(?P<to_address>.*@.*)>, ' \
     + r'relay=(?P<relay>.*), delay=(?P<delay>[0-9.]+), ' \
     + r'delays=(?P<delays>[0-9][0-9/.]+), dsn=(?P<dsn>[0-9].[0-9].[0-9]), ' \
@@ -53,6 +53,7 @@ class ParseResult:
     month: InitVar[str]
     day: InitVar[str]
     time: InitVar[str]
+    hostname: InitVar[str]
 
     mail_id: str
     to_address: str
@@ -65,7 +66,7 @@ class ParseResult:
 
     datetime: str = field(init=False)
 
-    def __post_init__(self, month: str, day: str, time: str) -> None:
+    def __post_init__(self, month: str, day: str, time: str, hostname: str) -> None:
         self.datetime = self.convert2dateime(month, day, time)
 
     def to_dict(self) -> ParseResultType:
@@ -73,5 +74,6 @@ def to_dict(self) -> ParseResultType:
 
     @staticmethod
     def convert2dateime(month: str, day: str, time: str) -> str:
+        day = day.rjust(2, '0')
         tmp = datetime.strptime(f'{month}{day}{time}', '%b%d%H:%M:%S')
         return tmp.replace(year=datetime.now().year).strftime('%Y%m%d%H%M%S')