If your email account is new, do not send too many emails with the first campaign. First, warm up around 1 month before your first campaign. Send emails to your friends, family and others and get some reply. Increase your domain reputation.
Do not include to many images in your email
Include an unsubscribe link
Keep your email content clean and simple with minimal formatting
Send emails from your personal account not from info accounts.
Personalize the emails
Do not send too many emails at once every day
Do not use spammy words. Couple of words to avoid in your email subject lines: