I would start small, with the minutes that are your responsibility. Bring copies of your original minutes and the ones they modified to the next meeting, and ask to have the minutes approved as you originally wrote them. If they won't let you do your job, then resign.
Are the treasurer and parent facilitator with you?
As to the bank accounts, that is clearly the treasurer's job. Does the treasurer also feel shut out? Can the treasurer not get copies of the bank statements?
I think the president does have the responsibility to manage the e-mail account, and there should be procedures for sending e-mail to everyone, so that the PTO doesn't send too much information or conflicting information.
Our PTO is small, there is a president, vice president, myself/secretary, treasurer and our parent facilitator. Our president and v.p. are very secretive about all that they do. They decide everything that the PTO is and will be doing. They donate without getting a legal vote. I set up an email account just for our PTO email, and they went in and changed the password and everything so I can't even access it. I take the notes at our meetings and they go and change it to their likings. They informed me that if I want to email or send anything to anyone, I have to get their approval first. Then our school secretary has 2 bank accounts at different banks and they are both named by our school pto. I didn't think school secretaries were suppose to have our accounts. I want to do something about it but the pres. and v.p. tell me to shut up. The school secretary won't even give us copies of the bank statements. She takes all the money from box tops for education, and another thing too that is suppose to be used for the children, not the school secretary. Is it just me, or is this one heck of a screwed up PTO? Any suggestions?