Guild Wars 2

I need more bank space for my items, because i started to use all my seven characters. So yesterday i saw that the sales are at half price and i bought my second account.
Right now i will use this account for storing materials and for playing the trading post.
How can i send money/materials between accounts without being banned?
I have seen posts of people being banned because of this.
So far i have sent materials like this to my sisters account, but only twice in all this time. With this new account it will happen more frequently and i would like to have some guidelines on how to avoid a ban.

Thank you in advance.

If you do get banned you can contact support and prove you own both accounts and get it unbanned. After that it will be on record and I wouldn’t think it would be a problem.

I would suggest only small amounts of gold at a time. There is bound to be a threshold but ANet is not going to tell us what the thresholds are as gold sellers can use that information to their advantage.

make a personal guild with only the 2 accts. as members

I mail items between my two accounts a lot. If I send myself gold, I include a message and a subject about what I’m doing. Haven’t had any issues. Yet.

Having a personal guild seems like a good idea. If i use email i will also try to describe what i am doing.
Thank you for the tips.

Just some added info on personal Guilds so you are aware of the potential risk:

In case of an account compromise, Support will provide ONE rollback for the account…this will NOT revert any associated Guild bank items or gold in the Guild bank or any potential changes or damages to any associated Guilds. Basically, Guilds will NEVER be reverted due to an account compromise.

Just so you are aware of this potential drawback to using a personal Guild for storage. Note that I have a personal Guild bank and have most of my gold in one.