iiNet subsidiary Westnet has reported that some email services are down following a server fault discovered early on Thursday morning.
The ISP said in a statement that 5000 of its 220,000 customers were affected by the fault.
According to comments on industry forum Whirlpool, emails were also down last week due to a similar server problem.
Westnet representative, Michael Richardson, said on the site that as of Thursday morning the fault was escalated with its email hosting vendor Zimbra and it was currently receiving priority treatment.
“Most services have been restored," the post reads. "Engineers are still working on restoring the last of the affected customers.
“There may be some delays as mail is delivered to relevant mailboxes."
In a post on Whirpool, a user claiming to be a Westnet customer said they had experienced receiving some emails to one account, and not to another. Another poster wrote the situation was "annoying" but Westnet was responding to problems at a faster rate than previously experienced.
The ISP’s glitch follows an announcement in January that Westnet will provide ADSL2+ services for the first time to approximately 140,000 homes in regional NSW and Western Australia as part of a $5 million broadband infrastructure upgrade.
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