This is a strange one, it looks like you are using the out of the box code slightly changed, which looks something like this: <p><font face="Verdana" size="1">If you no longer wish to receive these emails, click on the following link: <a href="%mkt_opt_out_prefix%UnsubscribePage.html?mkt_unsubscribe=1&mkt_tok=##MKT_TOK##">Unsubscribe</a><br/></font></p> You should try adding a <table> around your unsubscribe message so that in flows better, right now if it's in a <p> only, that may be causing the issue on iOS. Something like: <table> <tbody> <tr> <td><p><font face="Verdana" size="1">If you no longer wish to receive these emails, click on the following link: <a href="%mkt_opt_out_prefix%UnsubscribePage.html?mkt_unsubscribe=1&mkt_tok=##MKT_TOK##">Unsubscribe</a><br/> </font></p></td> </tr> </tbody> </table> I'd include whatever standard styling you have of course. Without seeing the full raw code and the unsubscribe code, it's hard to fully answer your question however.
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