Out Ironport dictionary contained p
ollock? .Please advice what for this is blocking (which category of spam,reason considered as spam)
I have found the term "pollock" in an older AsyncOS version, as you state it's in the profanity dictionary. Note that these dictionaries are not used for spam detection, as the name implicates its main intention is to be used in filters to prevent inappropriate language in outbound messages. Please don't use that dictionary for detecting spam. You can also remove that entry if it causes you false positives, as I can see it is not part of the recent dictionaries.
The reason why this word was included in the profanity dictionary was because it has been used as an insult towards Polish people. Check out the urban dictionary for a more detailed description: