Moses Shohet, a jquery form user who had hard time setting up SMTP for his business account. Thanks to his courtesy, here is the instructions, enjoy!
Enabling a business gmail account to work with "Less Secure Apps" is not as straightforward and simple as it is with standard gmail accounts. In any event, I have written here the steps that need to be followed in order to enable a business gmail account to work with "Less Secure Apps". You can post it on your website. It might help those who like me have a business gmail account and need to set it up so it will work with jQuery. Here are the instructions:
Allowing 'Less secure apps' (e.g. the jQueryForm) to have access to a business Gmail account and use it as an SMTP gateway: