Limitations
- maximum message size including headers is 30 MB
- password authentication is required to send messages through SMTP server
- maximum 10 simultaneous connections from one IP address when sending messages
- maximum 7 simultaneous connections from one IP address when receiving messages
- maximum 20 recipients for one message
- maximum 50 messages in 15 minutes from one user; when this limit is exceeded, sending of messages will be suspended for 10 minutes
- when external mail (RPOP) is used, maximum 3 remote records are allowed for one user and will be checked no more than once in 15 minutes
- maximum 7 connections to webmail interface from one IP address
- session time for webmail interface is 6 hours, but maximum 2 hours if inactive
- the following characters are allowed in a mailbox name: A...Z, a...z, 0...9, underscores ("_"), hyphens ("-"),
and dots ("."). The name must start and end with a letter and cannot have two consecutive dots
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Characteristics
- maximum total size of messages in one mailbox folder is 2GB
- if message cannot be delivered, next attempts will be every 30 minutes over the course of 3 hours and then every 2 hours over the course of a week
- maximum 30 messages per minute are allowed to be delivered to a single mailbox on mail server; when this limit is exceeded, delivery queue for this mailbox will halt for 10 minutes
- maximum 20 "Received" headers (including those added by our server)
- mail system will not receive messages if:
- domain part of return-path address is blank (absent)
- domain part of return-path address is in the form of IP address
- domain part of return-path address has neither MX record, nor A record in DNS
- domain part of return-path address has an MX record, but it points to a non-existent A record
- if mail system cannot receive information on domain part of return-path address in DNS, sender will get a temporary error and will have to resend the message
- messages sent using mailing lists or groups will not be delivered to subscribers with external addresses if:
- mailing list or group is created with a service domain like *.r01host.ru
- domain's MX records are pointing not to hosting servers
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