Gmail, Groups, & Contacts
Google will suspend your account if it detects abusive activity, such as phishing/spamming. If this occurs, you will have to wait 24 hours for Google to lift the suspension.
Receiving limit size = 50mb
Sending limit size = 25mb (If the file size is over 25mb, it will attach through Google Drive.)
Creating Labels (folders) to Organize Gmail
Google Groups let you easily communicate and collaborate with all group members: send email, create calendar events, and share your content within Google Drive, Calendars and more.
Contact Labels vs Google Groups
A contact list using labels is for your personal use.
If you have a list with 100s of contacts create a Google Group to avoid reaching sending limits. A Google Group has an email address associated with it and counts as 1 email, using Contact Labels counts as separate emails.