I'm wondering if it's considered casual and natural to start sentences without the pronoun, or if a native English speaker would find that odd and feel that I'm either being way too casual or that I'm not on point with grammar and question rather I'm a native English speaker or not.
Example of phrases omitting the pronouns:
(I) Just read that you.... (I) Noticed something about your.... (I) Appreciate that you're.... (I) Would love to know if.... (Do you) Mind if I send you... (I'm) Reaching out because... (I'm a) Big fan of the way you...
The context: I understand this is informal language. The situation I intend to use such phrases is on emails for business purposes. But with the goal of sounding friendly and slightly casual, only if it's natural and not way too casual nor odd to say it like that.
Thanks for any help.