dhl.com already delete some useless TXT record,at the moment,only 5 TXT record total,seems no problem now.

There are too many forged,virus,phishing email of DHL,so if SPF problem,maybe some email will be checked as clean. 

lenovo.com still no change until now,some foreign DNS is not so stable at China,maybe it is GFW issue? Not issue,most of case,we use Tecent 119.29.29.29,Aliyun 223.5.5.5,baidu 180.76.76.76 DNS.

If there is such function to add SPF record to config file,that will be good. As this problem happens only at such domains having too many TXT records.