Today I got a mail from my company but I am unable to figure out the meaning of がんばっぺ！！.
The sentence is as follows-
下期も 製図勉強会や(秘)レクレーション大会などを 予定しております。
Is it similar to がんばれ？
I see in your e-mail, that you mention 水戸｛みと｝市.
頑張っペ is 茨城弁｛いばらきべん｝.
っぺ is typically used to replace volitional form よう/おう sounds. It is used on this sign for example:
Thus, I would translate your example into
Note that using
っぺ has other uses, see the wikipedia entry if you feel up to it. The main other use is to make a guess, a conjecture.
Taken from this thread