IMAP mail disruption at Vodafone has been going on for days

Vodafone has been struggling with a disruption to its IMAP mail server for several days. Several readers of heise online reported problems that have been going on for a week. Email addresses with various domain endings are affected, including kabelmail.de and arcor.de. The company’s press office confirmed the problem when asked by heise online. The problems are reportedly related to the release of the iPhone operating system iOS 18. Everything should be working again in top quality by the end of this week.

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“With the rollout of Apple iOS 18, we are seeing a sharp increase in the load on the IMAP interface of our end-customer email systems such as arcor.de, vodafone.de, vodafonemail.de, kabelmail.de, etc. This increase in load naturally affects performance,” explained the Vodafone spokesperson. The company first reported the IMAP server problems on September 18th in Vodafone’s community forum. At the time, it was recommended to use the Vodafone Mail app or website, as the IMAP server was not usable at the time.

IMAP is currently working again on all mail user agents (MUA), except for a small group of iPhone users who have not yet migrated to iOS 18 and where the user accesses via Apple’s mail app, Vodafone said. Every other mail client on every other operating system works, but is currently a little slower than usual: “The response times are currently normally around 10 seconds instead of 2 seconds.” A service provider is working intensively to completely remove the restrictions.

Vodafone does not seem to be alone with the problems. Support forums contain various posts from users who apparently had problems retrieving emails from IMAP servers after the iOS 18 update. The exact cause of this is unknown. Initial investigations suggest that communication between Apple’s mail client and certain IMAP servers does not work properly after logging in. This is apparently not due to the encryption certificates. The error may subsequently result in further attempts to communicate with the server, which can lead to disruptions on servers with many accounts – as in the case of Vodafone – due to the large number of requests.


(mki)

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