How can I increase the maximum size for email signatures?

I've had a Galaxy Note 2 for a long time and never had a problem with my company's email signature (which is about 30 lines long, with legal language, etc.). I just upgraded to a Galaxy S7. Whether I copy/paste or I type the email signature from scratch, every time I get to about the 10th line and try to save it, it states that I have exceeded the maximum size limit for the email signature. I cannot believe that Samsung would have decreased the maximum size from a phone 3-4 years ago to now. I legally need this long signature on every email I send from my phone. Does anyone have any ideas? (I'd rather not get a third-party app for this). Thanks.

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