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Thank you in advance for your patience and understanding on the matter.
"Deferred" means in the first place, that the mail-server was not able to deliver the mail. You should investigate your different mail - logs, to see WHY this happens. Without any logs, we are just guessing and are not able to suggest decent solutions or workarounds.
Well... this answer is a bit too short, to investigate why the queue doesn't proceed on the next try - the log entry just points out, that there IS a queue, why the actual mail won't be delivered and why the new email is queued behind the others.
To tell postfix, to go to work immediatly you might want to force postfix with the command: "postqueue -f" ... but this doesn't solve the innitial problem, which you still have to investigate to get rid off.
Home > Tools & Settings > Server-wide mail settings > Settings
Limitations on outgoing email messages
The following limits are default. They can be overridden in each service plan and subscription. The limits do not work server-wide, but act as a template for the plans and subscriptions for which no custom limits were specified. Note that switching on the limitation of outgoing email messages can affect the mail server performance. Learn more about limiting outgoing mail
Disable this: Turn on limitations on outgoing email messages