Accepts an array of accounts, a single account object, or multiple OAuth credential files. Recognised keys: email, client_id, client_secret, refresh_token, daily_quota.

Google credentials.json files: these contain no email address, so name each file after its account — e.g. sender@gmail.com.json — and the address will be read from the filename automatically.

16 letters from Google. Spaces are stripped automatically. This is not your normal Gmail password.

JSON or CSV. Recognised keys: email, app_password, smtp_host, smtp_port, daily_quota. Plain text lines in the form sender@gmail.com:abcdefghijklmnop also work. Defaults to smtp.gmail.com port 587.

Max size: 25MB per file. Recognised columns/keys: email (required), first_name, last_name, company, phone.

CSV needs an email header. TXT accepts one email per line.

JSON: ["Subject A", "Subject B"] or [{"text": "Subject A"}]
CSV: a subject or text column  |  TXT: one subject line per row

Supported variables (case-insensitive, click any to insert):
%SenderName% %RandomCompanyName% %DueDate% %InvoiceDate% %RandomInvoiceNumber% %RandomShippingCharge% %RandomTotal% %FirstName% %LastName% %CustomerEmail% %UnsubscribeLink% %CompanyPhone%

Select one or more .html files — each file becomes a template named after the file name. Template variables like %SenderName%, %RandomCompanyName%, %FirstName% etc. are automatically replaced when sending.