The phrase "once again thank" is a correct and usable phrase in written English.
You can use it when expressing gratitude. For example: "Once again thank you for your kind hospitality."
So, once again, thank you.
Once again thank you. — Sincerely, George Zimmerman.
Beautiful and once again, thank you!
Once again, thank you for your letter.
Once again, thank you for your time and consideration.
We once again thank you for your patience".
As I was pulling out onto the road, I once again thanked Officer Trudel and he smiled and said you're welcome.
At a press conference held at end of her trip Ms. Salah once again thanked the President for his visionary declaration of abolishing school fees, and his support for the UNITE FOR CHILDREN UNITE AGAINST AIDS campaign.
"Let me conclude by once again thanking everyone who has helped in this campaign in one way or another," he added.
Let me conclude by once again thanking Mrs Mann for her constructive and positive report.
Mr President, I should like to begin by thanking Parliament for its excellent work and by once again thanking Mr Markov.
