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1&1 Mail Business Storage Limits

In the table below you will discover detailed information on the limitations of your inbox capacity and e-mail size.

Storage Limits
Function Description
Storage capacity 2 GB
Number of
You can store up to 40,000 e-mails in the inbox.
Size of
An e-mail may have a size of 40 MB, any e-mail that exceeds this limit will be rejected and will not be received.
Mass mailing You can send up to 3600 emails at once. However there is a possibility that e-mail clients may recognize this as SPAM which could result in these e-mails being automatically redirected to SPAM folders.
Please note:
You can not send e-mails with attachments over 10 MB in size. However, you can upload the file to a web page and send an e-mail with the URL.
For additional information, you may want to reference: