[verb (plain)] + からと言って [i-adj] + からと言って [na-adj] + だ + からと言って [noun] + だ + からと言って
からと言って means "just because": the first half is a fact, and the second half denies what you might conclude from it. It follows the plain form, with だ after a noun or な-adjective. It is usually written in kana, からといって.
What comes after からと言って is the conclusion being rejected, so it ends in わけではない, とはかぎらない限らない, or a warning such as べきではない or てはいけない. Without the denial, the sentence no longer says "just because".
With no denial, and the second half simply what someone did, からと言って reports the reason that person gave: "saying that", "on the grounds that". Here いって言って really is "saying".
In conversation it shortens to からって. からとて is the literary form, met in writing.