Your Friend, the Footer
If you receive messages from a group via email you've no doubt noticed that block of stuff at the bottom of each message. That's called a message "footer". If you read group messages on the Messages pages of the group you won't see these footers.
Note: Although both appear at the bottom of messages, footers are different from signatures, or sig-lines. Signatures are written by and specific to individual senders. The Groups.io message footers are added by the system and are not under an individual's control.
The format of the footer depends on the the type of message. It varies between formatted (HTML) versus unformatted (plain text) messages, and it is different for individual messages versus digests of messages.
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Formatted (HTML) Individual Message
View/Reply Online: This is a link to the message, shown in the group's Messages section. The number that follows is the message number
Reply to Group: This is a mailto: link ¡ª it causes your email interface to open a new message composition window, directed to the group's posting address. The new message will have the Subject line filled in, but will not contain a quote of the original (for that use Reply online). Note that proper functioning of this link is subject to the capabilities of your email interface and possibly to the settings in your operating system (default email client application).
Reply to Sender: This is a mailto: link ¡ª it causes your email interface to open a new message composition window, directed to the sender's address. The new message will have the Subject line filled in, but will not contain a quote of the original (for that use Reply online). Note that proper functioning of this link is subject to the capabilities of your email interface and possibly to the settings in your operating system (default email client application).
Mute this topic: This is a link to a page which will Mute this topic so that you do not receive further messages (by email) in this topic. See the Help page for more information on Muting and Following topics.
Follow this topic: [not shown] This is a link to a page which will Follow this topic so that you receive further messages (by email) in this topic. This will only be seen if you have selected Following Only and First Message Also in the Advanced Preferences section of your group Subscription. See the Help page for more information on Muting and Following hashtags.
Unfollow this topic: [not shown] This is a link to a page which will unfollow this topic so that you do not receive further messages (by email) in this topic. This will only be seen if you have selected Following Only in the Advanced Preferences section of your group Subscription. See the Help page for more information on Muting and Following hashtags.
New Topic: This is a link to the New Topic page in this group.
Mute #hashtag: [not shown] This is a link to a page which will Mute the named hashtag so that you do not receive further messages (by email) that have this hashtag. If there is more than one hashtag on this topic there will be a link for each. See the Help page for more information on Muting and Following hashtags.
Group-specific inclusion: [shown in later section] The group owners / moderators may include custom text in each message footer.
Your Subscription: This is a link to your Subscription page for this group. See the Help page for more information on your Subscription Options.
Group Home: This is a link to the group's Home page.
Contact Group Owner: This is a mailto: link ¡ª it causes your email interface to open a new message composition window, directed to the group's +owner address. The message will be forwarded to each Owner and Moderator of this group (except that each individual owner/mod may opt out of receiving such messages). The new message will have the Subject line filled in, but will not contain a quote of the original (for that use Reply online). Note that proper functioning of this link is subject to the capabilities of your email interface and possibly to the settings in your operating system (default email client application).
Terms: This is a link to Groups.io's Terms of Service page.
Unsubscribe: This is a link to a page that will unsubscribe you from this group.
Unformatted (plain-text) Individual Message
[description of features - work in progress]
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Formatted, aka Full Featured, Digest of Messages
Header at the top of the digest:
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Footer under each message:
Footer at the bottom of the digest:
[description of features - work in progress]
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Unformatted, aka Plain, Digest of Messages
Header at the top of the digest:
Footer under each message:
Footer at the bottom of the digest:
[description of features - work in progress]
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Group-specific addition to the footer
Formatted footer, with group-specific addition:
Plain text footer, with group-specific addition:
[Work in progress]
FAQ
Can I reduce or eliminate the footer?
No.
Can my group's owner reduce or eliminate the footer?
No, but the group can add its own section to the footer, see above.
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The official Groups.io user documentation is in the Groups.io Help Center.